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{{seealso|Extraterrestrial intelligence}}
{{seealso|Extraterrestrial intelligence}}
'''Unidentified flying objects''' ('''UFOs''' or '''U.F.O.s''') are aerial phenomena that cannot be readily explained as natural or man-made. Most sightings of 'UFO's turn out to be explained by aircraft, birds, heavenly bodies, or other everyday objects. Some can be explained as errors produced internally to a [[radar]], [[electro-optical tracking|electro-optical]], or other sensor, some arise from sensory illusions, and some are [[hoax]]es.
'''Unidentified flying objects''' ('''UFOs''' or '''U.F.O.s''') are aerial phenomena that cannot be readily explained. Most sightings of "UFO"s turn out to be explained by aircraft, birds, heavenly bodies, or other everyday objects. Some can be explained as errors produced by a [[radar]], [[electro-optical tracking|electro-optical device]], or other sensor, some arise from sensory illusions, and some are [[hoax]]es.
All investigators concede that some aerial sightings remain unexplained even after examination, but most dismiss the notion that there is any credible evidence that Earth is being, or has been, visited by creatures from other worlds.  
All investigators concede that some aerial sightings remain unexplained even after examination, but most dismiss the notion that there is any credible evidence that [[Earth]] is being, or has been, visited by creatures from other worlds.  


===The Kenneth Arnold sighting ===
===The Kenneth Arnold sighting ===
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In 1947 the [[U.S. government]] began studying them, often in [[classified information|classified]] projects.   
In 1947 the [[U.S. government]] began studying them, often in [[classified information|classified]] projects.   


 
===The Roswell incident===
===Roswell incident===
{|align="right" style="width:50%;"
{|align="right" style="width:50%;"
|
|
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Results of a Search for Records Concerning the 1947 Crash Near Roswell, New Mexico (Letter Report, 07/28/95, GAO/NSIAD-95-187)] Government Accounting Office.</ref>
Results of a Search for Records Concerning the 1947 Crash Near Roswell, New Mexico (Letter Report, 07/28/95, GAO/NSIAD-95-187)] Government Accounting Office.</ref>
{{col-end}}
{{col-end}}
In July 1947, a press release issued by the Roswell Army Air Field (RAAF) public information officer stated that the field's 509th Bomb Group had recovered a crashed "flying disk" from a ranch near [[Roswell, New Mexico]]. The next day, the press reported the Commanding General of the Eighth Air Force as stated that, in fact, a radar-tracking balloon had been recovered by the RAAF personnel, not a "flying disc." A press conference was shown debris from the crashed object, which seemed to confirm the weather balloon description.
In July 1947, a press release, issued by the Roswell Army Air Field (RAAF) public information officer, stated that the field's 509th Bomb Group had recovered a crashed "flying disk" from a ranch near [[Roswell, New Mexico]]. The next day, the press reported the Commanding General of the Eighth Air Force as stating that, in fact, a radar-tracking balloon had been recovered by the RAAF personnel, not a "flying disc." A press conference was shown debris from the crashed object, which seemed to confirm the weather balloon description.


However, thirty years later, in 1978,  Major Jesse Marcel, who had been involved with the original recovery of the debris, was interviewed by a ufologist, Stanton T. Friedman. In that interview, Marcel claimed that the military had covered up the recovery of an alien spacecraft. The story was rapidly embellished with allegations of further cover-ups, autopsies of alien bodies, and intimidation of witnesses.
However, thirty years later, in 1978,  Major Jesse Marcel, who had been involved with the original recovery of the debris, was interviewed by a ufologist, Stanton T. Friedman. In that interview, Marcel claimed that the military had covered up the recovery of an alien spacecraft. The story was rapidly embellished with allegations of further cover-ups, autopsies of alien bodies, and intimidation of witnesses.
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==Ufology==
==Ufology==
{{main|Ufology}}
There is a movement, loosely called [[ufology]] or Ufology, that investigates and reports phenomena. Much of the reporting is anecdotal and unscientific, but some of the leadership of UFO research centers, such as [[Mark Rodeghier]] of the [[Center for UFO Studies]] (CUFOS), the Mutual UFO Network (MUFON) and French born UFO researcher [[Jacques Vallée]], participate in much more technical discussions, such as the 1997 symposium on physical evidence from UFOs. Physicist Stanton Friedman is an established UFO researcher.<ref name="urlStanton Friedman - Biography">{{cite web
There is a movement, loosely called [[ufology]] or Ufology, that investigates and reports phenomena. Much of the reporting is anecdotal and unscientific, but some of the leadership of UFO research centers, such as [[Mark Rodeghier]] of the [[Center for UFO Studies]] (CUFOS), the Mutual UFO Network (MUFON) and French born UFO researcher [[Jacques Vallée]], participate in much more technical discussions, such as the 1997 symposium on physical evidence from UFOs. Physicist Stanton Friedman is an established UFO researcher.<ref name="urlStanton Friedman - Biography">{{cite web
|url=http://www.stantonfriedman.com/index.php?ptp=stans_bio
|url=http://www.stantonfriedman.com/index.php?ptp=stans_bio
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  | journal = Journal of Scientific Exploration |volume = 12 | issue = 2| pages = 179-229
  | journal = Journal of Scientific Exploration |volume = 12 | issue = 2| pages = 179-229
  | author = [[Peter Sturrock]] ''et al.''
  | author = [[Peter Sturrock]] ''et al.''
  | year = 1998}}</ref>  However, [[Philip Klass]] has written that "SSE’s annual conferences typically feature several pro-UFO speakers, but no UFO-skeptics. For example, at SSE’s 1996 conference there were four pro-UFO speakers, but no skeptics.<ref>{{citation
  | year = 1998}}</ref>  However, [[Philip Klass]] has written that "SSE's annual conferences typically feature several pro-UFO speakers, but no UFO-skeptics. For example, at SSE's 1996 conference there were four pro-UFO speakers, but no skeptics.<ref>{{citation
  | journal = The Skeptics UFO Newsletter
  | journal = The Skeptics UFO Newsletter
  | author = Philip J. Klass
  | author = Philip J. Klass
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}}</ref>
}}</ref>


In June 2010, James Carrion, formerly international director of the [[Mutual UFO Network]], set up the Center for UFO Truth, to "answer one question – did the United States and its allies purposely create the UFO myth as part of a cold war deception operation? It makes sense to include the subject of CUT’s research efforts in its title." <ref>{{citation
In June 2010, James Carrion, formerly international director of the [[Mutual UFO Network]], set up the Center for UFO Truth, to "answer one question – did the United States and its allies purposely create the UFO myth as part of a cold war deception operation? It makes sense to include the subject of CUT's research efforts in its title." <ref>{{citation
  | url = http://sharepoint.centerforufotruth.org:27894/Lists/Announcements/DispForm.aspx?ID=4
  | url = http://sharepoint.centerforufotruth.org:27894/Lists/Announcements/DispForm.aspx?ID=4
  | title = Announcements: Frequently Asked Questions  
  | title = Announcements: Frequently Asked Questions  
  | publisher = Center for UFO Truth
  | publisher = Center for UFO Truth
  | date = 28 June 2010}}</ref>
  | date = 28 June 2010}}</ref>
==History==
Since the advent of aviation, there have been both instrumental and visual detections of things that could not be explained at the time. The term "gremlin" was used to describe, among other electronic phenomena, unexplained readings from World War II radar systems. There are also many misidentifications, such as the interpretation of the radar detection of the incoming [[Japan|Japanese]] force at the [[Battle of Pearl Harbor]] as incoming friendly [[B-17]] bombers.
When the [[AN-|AN/]][[FPS-50]] early warning radar, part of the [[Ballistic Missile Early Warning System]] (BMEWS), went into service in 1960, it soon reported a massive [[Soviet Union|Soviet]] missile attack on the U.S., which proved to be due to unexpected reflections of the radar beam from the [[Moon]].


==Project BLUE BOOK==
==Project BLUE BOOK==
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<font color="darkblue">
<font color="darkblue">
:A panel of the [[National Academy of Sciences]] reviewed the Condon report, and observed  
:A panel of the [[National Academy of Sciences]] reviewed the Condon report, and observed  
:''"The Report recognizes that there remain UFO sightings that are not easily explained. The Report does not suggest, however, so many reasonable and possible directions in which an explanation may eventually be found, that there seems to be no reason to attribute them to an extraterrestrial source without evidence that is much more convincing. The Report also shows how difficult it is to apply scientific methods to the occasional transient sightings with any chance of success. While further study of particular aspects of the topic (e.g., atmospheric phenomena) may be useful, a study of UFOs in general is not a promising way to expand scientific understanding of the phenomena. On the basis of present knowledge the least likely explanation of UFOs is the hypothesis of extraterrrestrial visitations by intelligent beings."<ref>{{citation
:''"there remain UFO sightings that are not easily explained ...[but]... there seems to be no reason to attribute them to an extraterrestrial source without evidence that is much more convincing. ... On the basis of present knowledge the least likely explanation of UFOs is the hypothesis of extraterrestrial visitations by intelligent beings."<ref>{{citation
  | url = http://www.project1947.com/shg/articles/nascu.html  
  | url = http://www.project1947.com/shg/articles/nascu.html  
  | publisher = National Academy of Sciences
  | publisher = National Academy of Sciences
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{{col-end}}
{{col-end}}


In 1947, the [[U.S. Air Force]] began 'Project Blue Book' to collate UFO sightings. It was terminated after the Condon Report (see later) led the Secretary of the Air Force to decide there was no national security value to continuing investigations. A total of 12,618 sightings were reported to the Project, of which 701 remained "Unidentified." <ref name=NARA-UFO>{{citation
In 1947, the [[United States Air Force]] began 'Project Blue Book' to collate UFO sightings. It was terminated after the Condon Report (see later) led the Secretary of the Air Force to decide there was no national security value to continuing investigations. A total of 12,618 sightings were reported to the Project, of which 701 remained "Unidentified." <ref name=NARA-UFO2>{{citation
  | url = http://www.archives.gov/foia/ufos.html
  | url = http://www.archives.gov/foia/ufos.html
  | title = U.S. Air Force Fact Sheet Concerning UFO's and Project BLUE BOOK
  | title = U.S. Air Force Fact Sheet Concerning UFO's and Project BLUE BOOK
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  | url = http://www.ufoskeptic.org/sturrock/toc.html
  | url = http://www.ufoskeptic.org/sturrock/toc.html
  | year = 1987 | title = An Analysis of the Condon Report on the Colorado UFO Project
  | year = 1987 | title = An Analysis of the Condon Report on the Colorado UFO Project
  | journal = J. Scientific Exploration | volume = 1 | issue = 1 | page = 75}}</ref>  
  | journal = J. Scientific Exploration | volume = 1 | issue = 1 | page = 75}}</ref>
 
== UFO Classification ==
 
===Hynek's Classification ===
*Nocturnal Disks:  Objects seen in the night sky. This is the most commonly reported UFO sighting.
*Daylight Disks:  UFOs that could be seen flying high in the sky or close to the ground. Oval or round disks are commonly seen with this type of UFO sighting.
*Radar Visual:  UFOs that are seen on radar screens while also being visually confirmed by eyewitnesses on the ground.
*Close Encounter of the First Kind:  UFOs that are seen within 200 yards of the witness. There is no interaction between the witness and the UFO.
*Close Encounter of the Second Kind: Electrical equipment such as a car ignition may operate strangely. Other electrical equipment may malfunction while the UFO is present. Other forms of interaction may include physical effects to plants, animals or human beings. There could be traces of burned grass for example in a Close Encounter of the Second Kind.
*Close Encounter of the Third Kind: Seeing humanoid like creatures associated with the UFO. There is usually no interaction between the human witness and the humanoid. In some reports there have been interactions reported between the UFO witness and the humanoids.<ref>http://www.cufos.org/HynekClass.html</ref>
*Close Encounters of the Fourth Kind: Interaction between the UFO witness and abduction by humanoid entities.<ref>http://jacquesvallee.net/bookdocs/classif.pdf</ref>
 
===Jacques Vallee's UFO Classification===
*AN1:  Viewing anomalous lights or explosions in the sky that do not affect the witness or the environment.
*AN2:  Reports that show lasting effects such as flattened grass, poltergeist activity or anomalous photographs.
*AN3:  Cases that include entities. This could include ghosts, yetis (Abominable Snowman), elves, spirits and cryptozoology.
*AN4:  The witness reports interaction with the entities within the reality of the entities themselves. This type of experience could include Near Death Experiences, religious visions and out-of-body experiences (OBEs).<ref>http://jacquesvallee.net/bookdocs/classif.pdf</ref>


===French space agency===
===French Space Agency Classification===
In 1977 the French space agency, CNES, set up a unit to record witness accounts of abnormal phenomena observed in the sky. <ref name=GEIPANISEPRA>{{citation
In 1977 the French space agency, CNES, set up a unit to record witness accounts of abnormal phenomena observed in the sky. <ref name=GEIPANISEPRA>{{citation
  | url =http://www.cnes.fr/web/CNES-en/5866-geipan-uap-investigation-unit-opens-its-files.php
  | url =http://www.cnes.fr/web/CNES-en/5866-geipan-uap-investigation-unit-opens-its-files.php
  | title =  Le Geipan, the French [unidentified aerospace phenomena] UAP research and information group  
  | title =  Le Geipan, the French [unidentified aerospace phenomena] UAP research and information group  
  | publisher = Centre National d’Etudes Spatiales (CNES)}}</ref>
  | publisher = Centre National d'Etudes Spatiales (CNES)}}</ref>
<ref>{{citation
<ref>{{citation
  | title = GEIPAN UAP investigation unit opens its files
  | title = GEIPAN UAP investigation unit opens its files
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*Type D: Observations are consistent and accurate but cannot be explained in terms of conventional phenomena. 9% of sightings were in this category.
*Type D: Observations are consistent and accurate but cannot be explained in terms of conventional phenomena. 9% of sightings were in this category.


== UFO Classification ==
In the USA, there are two well known UFO groups: the [[Center for UFO Studies]] (CUFOS) founded by J. Allen Hynek, who was the chairman of astronomy at [[Northwestern University]], and the [[Mutual UFO Network]] (MUFON) lead by Allen Utke, Associate Professor of Chemistry at [[Wisconsin State University]]. Hynek originally doubted that the reports had any substance, but later changed his mind during his research with [[#Project BLUE BOOK|Project BLUE BOOK]].<ref name=CUFOS>[http://www.cufos.org/org.html Center for UFO Studies]</ref>. CUFOS collects UFO reports, maintains a UFO research library, and offers two publications concerning the UFO phenomena. There are two major systems for classifying the reports, first based on shape and other visually observed characteristics, movement, and  interaction with the environment or possible entities. In addition, some large data bases categorize by shape or other aspects of visual observations. Some of these classifications assume not only an object that could not be explained, but also indications of a nonhuman intelligence. <ref>[http://www.cufos.org/HynekClass.html J.Allen Hynek Center for UFO Studies]</ref><ref name=Vallee>{{citation
In the United States, there are two well known UFO groups: the J. Allen Hynek [[Center for UFO Studies]] (CUFOS) founded by J. Allen Hynek, who was the chairman of astronomy at [[Northwestern University]]; and the [[Mutual UFO Network]] (MUFON) lead by Allen Utke, Associate Professor of Chemistry at [[Wisconsin State University]]. There is also work by a French-born researcher, [[Jacques Vallée]].
 
Hynek originally doubted that the reports had any substance, but later changed his mind during his research with [[#Project BLUE BOOK|Project BLUE BOOK]].<ref name=CUFOS>[http://www.cufos.org/org.html Center for UFO Studies]</ref>. CUFOS collects UFO reports, maintains a UFO research library, and offers two publications concerning the UFO phenomena.  
 
There are two major systems for classifying the reports, first based on shape and other visually observed characteristics, movement, and  interaction with the environment or possible entities. In addition, some large data bases categorize by shape or other aspects of visual observations.
 
Some of these classifications assume not only an object that could not be explained, but also indications of a nonhuman intelligence, either extraterrestrial or terrestrial. While mainstream science does work in a [[Search for Extraterrestrial Intelligence]], its focus has been on intelligently generated radio signals, not physical visitation.
 
===Hynek's Classification ===
 
*Observational aspects
**Nocturnal Disks:  Objects seen in the night sky. This is the most commonly reported sighting.
**Daylight Disks:  UFOs that could be seen flying high in the sky or close to the ground. Oval or round disks are commonly seen with this type of UFO sighting.
**Radar Visual:  UFOs that are seen on radar screens while also being visually confirmed by eyewitnesses on the ground.
**(not listed in classification, but radar-only would seem needed)
*Behavioral aspects
**Close Encounter of the First Kind:  UFOs that are seen within 200 yards of the witness. There is no interaction between the witness and the UFO.
**Close Encounter of the Second Kind: Electrical equipment such as a car ignition may operate strangely. Other electrical equipment may malfunction while the UFO is present. Other forms of interaction may include physical effects to plants, animals or human beings. There could be traces of burned grass for example.
**Close Encounter of the Third Kind: Seeing [[humanoid]] like creatures associated with the UFO. There is usually no interaction between the witness and the humanoid. <ref>[http://www.cufos.org/HynekClass.html J.Allen Hynek Center for UFO Studies]</ref>
**Close Encounters of the Fourth Kind: Interaction between the witness and abduction by humanoid entities.<ref name=Vallee>{{citation
  | url = http://jacquesvallee.net/bookdocs/classif.pdf  
  | url = http://jacquesvallee.net/bookdocs/classif.pdf  
  | title = A System of Classification and Reliability Indicators for the Analysis of the Behavior of Unidentified Aerial Phenomena
  | title = A System of Classification and Reliability Indicators for the Analysis of the Behavior of Unidentified Aerial Phenomena
  | author = Jacques F. Vallée | date = April 2007}}</ref>
  | author = Jacques F. Vallée | date = April 2007}}</ref>


===Jacques Vallée's UFO Classification===
UFOs have been reported in varying shapes and colors. According to the 'National UFO Reporting Center' (as of July 2010), 12,023 lights have been reported by witnesses, 6,020 triangles, 5,181 circles and 4,784 disks .<ref>[http://www.nuforc.org/webreports/ndxshape.html ''Report Index by Shape of Craft'', National UFO Report Center] </ref> Reports in the database are transcriptions of witness self-reports and are not evaluated.<ref name="urlNational UFO Reporting Center Web Reports">{{cite web
 
|url=http://www.nuforc.org/webreports.html
*AN1:  Viewing anomalous lights or explosions in the sky that do not affect the witness or the environment.
|title=National UFO Reporting Center Web Reports
*AN2:  Reports that show lasting effects such as flattened grass, [[poltergeist]] activity or anomalous photographs.
|format=
*AN3:  Cases that include entities. This could include [[ghost]]s, [[yeti]]s (Abominable Snowman), [[elf|elves]], [[spirit]]s and [[cryptozoology]].
|work=
*AN4:  The witness reports interaction with the entities within the reality of the entities themselves. This type of experience could include [[near-death experience]]s, [[religious vision]]s and [[out-of-body experience]]s (OBEs).
|accessdate=2010-08-31
*MA1:  A UFO that drops, maneuvers, loops.
}}</ref>
*MA2:  A UFO that includes a physical interaction with the environment while performing drops, maneuvers or loops. An example of this would be seeing a UFO near a [[power plant]].
*MA3:  Witnessing entities on board a UFO while performing the above mentioned maneuvers.
*MA4:  The UFO witness observes the listed actions and goes through a transformational experience during the event.
*MA5:  The UFO witness suffers serious or injury as a result of seeing a UFO in the sky.<ref name=Vallee/>
 
===UFO shapes===
UFOs have been reported in varying shapes and colors. According to the National UFO Reporting Center statistics, 12,023 lights were reported, 6,020 triangles were reported, 5,181 circles and 4,784 disks were reported as of July 2010.<ref>[http://www.nuforc.org/webreports/ndxshape.html ''Report Index by Shape of Craft'', National UFO Report Center] </ref> Reports in the database are transcriptions of witness self-reports and are not cross-indexed, correlated, or evaluated.
 
Categorizing shapes is considered a challenging problem in both visual perceptual psychology and computer vision.<blockquote>To recognize a previously seen object, the visual system must overcome the variability in the object's
appearance caused by factors such as illumination and pose. Developments in computer vision suggest
that it may be possible to counter the in£uence of these factors, by learning to interpolate between stored
views of the target object, taken under representative combinations of viewing conditions. Daily life situations, however, typically require categorization, rather than recognition, of objects. Due to the open-ended
character of both natural and arti¢cial categories, categorization cannot rely on interpolation between
stored examples.<ref name=Edelman>{{citation
| url = http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1692007/pdf/9304686.pdf
| title = A model of visual recognition and categorization
| author = Shimon Edelman and Sharon Duvdevani-Bar
| journal =Phil.Trans. R. Soc. Lond. B
| year = 1997 | volume = 352 | pages =  1191-1202}}</ref></blockquote>
 
Note that the cited study deals with recognition of previously seen objects. The categorization of objects of a type never before encountered is more difficult.


The home page of the National UFO Reporting Center notes <blockquote>'''Events across the United States and Canada on the evening of Sunday, July 04, 2010'''  
The home page of the National UFO Reporting Center noted (with tongue firmly in cheek) 'Events across the United States and Canada on the evening of Sunday, July 04, 2010.'  
</blockquote><blockquote>
<blockquote>
Over the last 48 hours, NUFORC has received almost 100 similar reports of very peculiar events, which have been witnessed across the U. S. and Canada on July 4th, and perhaps on July 3rd, as well.  The sightings are a phenomenon for which we have no ready explanation.  Many of the reports from both days have been submitted by seemingly serious-minded individuals, many of whom apparently witnessed the events with multiple other witnesses present. The reports are similar, in that the witnesses have described seeing strange red, orange, or yellow “fireballs,” which have been seen either to hover in the night sky, or to streak overhead, sometimes individually, and on some occasions in clusters.  In some instances, the objects were observed against a clear, cloudless sky, and in other cases, they were observed below solid or broken overcast.<ref>{{citation
"Over the last 48 hours, NUFORC has received almost 100 similar reports of very peculiar events, which have been witnessed across the U.S. and Canada on July 4th, and perhaps on July 3rd, as well.  The sightings are a phenomenon for which we have no ready explanation.  Many of the reports from both days have been submitted by seemingly serious-minded individuals, many of whom apparently witnessed the events with multiple other witnesses present. The reports are similar, in that the witnesses have described seeing strange red, orange, or yellow “fireballs,” which have been seen either to hover in the night sky, or to streak overhead, sometimes individually, and on some occasions in clusters.  In some instances, the objects were observed against a clear, cloudless sky, and in other cases, they were observed below solid or broken overcast."<ref>{{citation
  | url = http://www.nuforc.org/
  | url = http://www.nuforc.org/
  | date = 6 July 2010
  | date = 6 July 2010
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  | publisher = National UFO Reporting Center}}</ref> </blockquote>
  | publisher = National UFO Reporting Center}}</ref> </blockquote>


The center did not plot the events by time, by location, or correlate appearance and movement versus time or observer position.  It can be noted that on the nights of July 4 in the United States, there routinely is a high incidence of unusual lights in the sky; July 4 &mdash; U.S. Independence Day &mdash; is customarily greeted with [[firework]]s.  Indeed, an exceptionally high incidence of lights in the sky was reported on July 4, 2009, by the Mutual UFO Network.<ref>{{citation
Indeed, an exceptionally high incidence of lights in the sky had been reported on July 4, 2009, by the Mutual UFO Network.<ref>{{citation
  | title =UFOs spotted over 10 states during July 4th celebrations
  | title =UFOs spotted over 10 states during July 4th celebrations
  | date = 5 July 2009
  | date = 5 July 2009
  | url = http://www.examiner.com/x-2363-UFO-Examiner~y2009m7d5-UFOs-spotted-over-10-states-during-July-4th-celebrations
  | url = http://www.examiner.com/x-2363-UFO-Examiner~y2009m7d5-UFOs-spotted-over-10-states-during-July-4th-celebrations
  | journal = Boston Examiner}}</ref>
  | journal = Boston Examiner}}</ref>
The National UFO Reporting Center does input unverified data showing date, time, location and type of UFO sighted. <ref name="urlNational UFO Reporting Center Web Reports">{{cite web
|url=http://www.nuforc.org/webreports.html
|title=National UFO Reporting Center Web Reports
|format=
|work=
|accessdate=2010-08-31
}}</ref>
The Mutual UFO Network tracks data using the live UFO Stalker map. <ref name="urlUFO Stalker">{{cite web
|url=http://www.ufostalker.com/?mufon=true
|title=UFO Stalker
|format=
|work=
|accessdate=2010-08-31
}}</ref>
MUFON maintains a searchable UFO Case Management System. The researcher can search by date, shape, or location. <ref name="urlUntitled Document">{{cite web
|url=http://www.mufon.com/mufonreports.html
|title=Untitled Document
|format=
|work=
|accessdate=2010-08-31
}}</ref>
MUFON investigators may be assigned to a reported UFO sighting. The results of the investigation may never be revealed or be revealed once a complete investigation is done.
It should be noted that bright lights of normal origin, against a dark sky, can produce visual afterimages of substantial duration. Point sources can appear to have trails of light.<ref>{{citation
| title = Cognitive psychology: connecting mind, research, and everyday experience
|author =  E. Bruce Goldstein
| url = http://books.google.com/books?id=XkBoSZ0O1bwC&pg=PT180&lpg=PT180&dq=%22Persistence+of+vision%22+trail&source=bl&ots=ljrPnzRt1S&sig=e7hlbECn-I8KXLEsyp5_fJHws4s&hl=en&ei=-SZJTNO6GoH-8Aaoh_XODg&sa=X&oi=book_result&ct=result&resnum=1&ved=0CBYQ6AEwADgK#v=onepage&q=%22Persistence%20of%20vision%22%20trail&f=false
| publisher = Wadsworth | year = 2007
}}, pp. 143-145</ref>
This is not to suggest that there were no unexplainable reports among these. It is extremely difficult to correlate among the witness reports. The U.S. is not covered by precision radar and there may be no other non-visual sensors. Air Traffic Control uses [[transponder]], not [[radar]], tracking.
==Criteria for reliable observation==
===Visual light spectrum===
The 1997 symposium said "The panel expressed the opinion that detailed analysis of photographic evidence
was unlikely by itself to yield evidence sufficient to convince a neutral
scientist of the reality of a new strange phenomenon unless a number of additional
detailed conditions are met.... They also expressed concern
that, now that modern digital techniques are easily available in photo
laboratories, it may never be possible to rule out possible hoaxes without convincing,
corroborative eye-witness accounts."<ref>"Physical Evidence", p. 189</ref>
====Photography====
[[Richard Haines]] discussed  UFO photography, and observations on best photographic and interpretive practice. "...one must be careful to fully document seemingly unimportant details concerning the person taking the photograph, the social situation which surrounded the photograph(s), the camera-lens-film data, the developing-printing- enlarging activities and the manner in which the photograph came
to the attention of the investigator. Since such a photograph image is only as credible as the photographer who took it, one must exercise "due diligence" in each of the above areas. Many older UFO photographs remain useless artifacts of the UFO enigma because the investigator did not or could not
obtain all of the relevant background information. "<ref>{{citation
| journal = Journal of Scientific Exploration
| volume = 1 | issue = 2 | pages =  129-147 | year = 1987
| title = Analysis of a UFO Photograph
| author = Richard Haines
| url = http://www.scientificexploration.org/journal/jse_01_2_haines.pdf}}</ref>
====Luminosity====
Considerable attention was given to [[luminosity]] of objects, which were often described as very bright lights. This is especially important in the reports of the French astronomer and UFO researcher, Jacques Vallée. He described six visual sightings, with estimates of power into the megawatt range. "Vallée cautioned the panel that the estimates of luminosity
presented at the workshop are raw approximations derived from a comparison
of the estimated intensity in the visible band with the intensity of
known sources, such as the full moon and automobile headlights, and from assumptions
concerning the distance and perhaps size of the source.
The panel noted that the human eye is a very poor device for measuring absolute
luminosities: the state of dark adaptation of the eye affects the amount
of light reaching the retina, and different parts of the retina respond differently
to light. Furthermore, the above luminosity estimates were apparently based
on the assumption of isotropic emission. This may be a reasonable assumption
for a natural phenomenon, but could be inappropriate if a case involves a technological
device. For instance, aircraft landing lights are highly anisotropic. A
1 kW source that is beamed with a half-angle of 3.6 degrees has the same intensity
as a 1 Mw isotropic emitter. Furthermore, the distance estimates may
be quite dubious. Hence the power estimates derived for the above cases must
be considered quite uncertain."<ref>"Physical Evidence", pp. 190-191</ref>
===Radar===
{{seealso|Radar MASINT}}
While radar technology has improved constantly since 1947, the 1997 symposium warned against accepting radar reports without other confirmation. With UFOs, the challenge is having a radar within range of a sighting, and agetting full access to military records, as military radar is far more informative about object analysis than is civilian air traffic control. In the 1990s, however, the Swiss and French militaries provided UFO researchers with  substantial access. Two incidents provided correlated visual and radar information.
However, even advanced military radars may reject contacts that do not meet preprogrammed plausibility parameters.  While [[ballistic missile defense]], space launch and surveillance, and [[Radar MASINT]] systems have a wider tactical range, typical air defense radars will not display contacts that have speeds above Mach 4-6.


==Cultural effects==
==Cultural effects==
Line 312: Line 204:
  | url =http://www.philosophypress.co.uk/?p=1380}}</ref> Probably, but not necessarily: it only proves that there is a cultural dimension in our assumptions about what constitutes unusual behaviour. A ''New York Times'' editorial titled "Out of This World, Out of Our Minds" observed that:
  | url =http://www.philosophypress.co.uk/?p=1380}}</ref> Probably, but not necessarily: it only proves that there is a cultural dimension in our assumptions about what constitutes unusual behaviour. A ''New York Times'' editorial titled "Out of This World, Out of Our Minds" observed that:


<blockquote>...our cultural love affair with little green men has gone through the stages of many passionate relationships—the fear and hopefulness of "The Day The Earth Stood Still" in 1951; the quirky cuddliness of Ray Walston as "My Favorite Martian" in the '60s. We laugh, we cry, and then we scream again.<br/><br/>
<blockquote>...But these days,... "The 'Modern Myth of Things Seen in the Sky' no longer resonates with the public the way it did when a tricorder or talking computers seemed miraculous," he said.<ref>"Out of This World, Out of Our Minds," by John Schwartz, ''The New York Times'', editorial page, July 2, 2010, at [http://www.nytimes.com/2010/07/04/weekinreview/04schwartz.html?_r=1&scp=1&sq=+cellphone%20+UFO&st=cse]</ref></blockquote>


Off screen, however, we seem to have drifted apart: sightings rarely capture the popular imagination. Now that cellphone cameras are all but ubiquitous, there isn’t a moment that can’t be snapped—so if the truth really were out there, we’d see it. And we haven't.<br/><br/>
==Scientific consensus==
 
In 1975, Brinsley le Poer Trench inherited the title Lord Clancarty and took up his seat in the House of Lords. In 1979, he persuaded the House to debate the subject of UFOs, believing that the public should be prepared for imminent contact with extra-terrestrials. The debate covered such issues as whether the inhabitants of other worlds have immortal souls, and allowed members of the peerage opportunities to recount their own sightings. Lord Hewlett made one of the few who represented the scientific consensus in the debate. Explaining that he had been briefed by Sir Bernard Lovell, Fellow of the Royal Society and Nuffield Professor of Radio Astronomy at Manchester University Department of Radio Astronomy and director of the Jodrell Bank radio observatory, he said:
That isn't to say that the number of sightings has dwindled. Groups like the National UFO Reporting Center receive hundreds of reports each month, and The ''[[Weekly World News]]'' supplies the latest in otherworldly headlines. ("Alien Tells Larry King to Leave CNN," the newspaper reported on June 29.)<br/><br/>
<blockquote>
 
''"Of all the thousands of reports of sightings that have been made, whenever it has been possible to make an investigation they have been found to be natural phenomena, or ... pure myth. Over the United Kingdom, Jodrell Bank's radio telescope, the first and still one of the most powerful in the world, has observed thousands of possible subjects for identification as UFOs. but not a single one has proved other than natural phenomena...
...But these days, U.F.O. sightings rarely cause a stir outside of Mr. McGinness’s pages or Web sites for buffs, says [[John Pike]] of GlobalSecurity.org. "The 'Modern Myth of Things Seen in the Sky' no longer resonates with the public the way it did when a tricorder or talking computers seemed miraculous," he said.<ref>"Out of This World, Out of Our Minds," by John Schwartz, ''The New York Times'', editorial page, July 2, 2010, at [http://www.nytimes.com/2010/07/04/weekinreview/04schwartz.html?_r=1&scp=1&sq=+cellphone%20+UFO&st=cse]</ref></blockquote>
</blockquote>
 
He explained that the great majority of reports can be attributed to the entry into the atmosphere of meteorites or more rarely, space debris.
While the public eye has been most attracted by close encounters, the [[Search for Extraterrestrial Intelligence]] project emphasizes a systematic search for radio signals.
<blockquote>
"Just take a tiny country like Holland. One hundred rocks the size of your fist come through the atmosphere and hit that country in one year. Consider Holland in relation to the size of the whole of the world's surface and you must surely realise that we are under constant bombardment, not with UFOs but with meteorites." <ref>[http://hansard.millbanksystems.com/lords/1979/jan/18/unidentified-flying-objects#S5LV0397P0_19790118_HOL_432
] from the Hansard transcript of House of Lords debate on unidentified flying objects 18th January 1979</ref>
</blockquote>


== References==
== References==
{{reflist|2}}
{{reflist|2}}
[[Category:Suggestion Bot Tag]]

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See also: Extraterrestrial intelligence

Unidentified flying objects (UFOs or U.F.O.s) are aerial phenomena that cannot be readily explained. Most sightings of "UFO"s turn out to be explained by aircraft, birds, heavenly bodies, or other everyday objects. Some can be explained as errors produced by a radar, electro-optical device, or other sensor, some arise from sensory illusions, and some are hoaxes. All investigators concede that some aerial sightings remain unexplained even after examination, but most dismiss the notion that there is any credible evidence that Earth is being, or has been, visited by creatures from other worlds.

The Kenneth Arnold sighting

UFOs became popularly known as flying saucers after a story in the East Oregonian newspaper, on June 26, 1947, reported salesman Kenneth Arnold's sighting of extremely fast-moving, "saucer-like objects" while flying a private plane.[1] A follow-up newspaper story coined the term "flying saucer" to describe the objects that Arnold reported sighting. [2]

In the USA, sightings increased sharply after the Kenneth Arnold sighting, and most were conflated into claims of "flying saucers" or other "vehicles from outer space" that some believed were directed by extraterrestrial intelligences—some skeptics called this "mass hysteria" or "mass delusion".[3] In 1947 the U.S. government began studying them, often in classified projects.

The Roswell incident

"The Air Force research did not locate or develop any information that the "Roswell Incident" was a UFO event nor was there any indication of a "cover-up" by the Government. Information obtained through exhaustive records searches and interviews indicated that the materials recovered near Roswell was consistent with a balloon devise of the type used in a then classified project. No records indicated or even hinted at the recovery of "alien" bodies or extraterrestrial materials." [4][5]

In July 1947, a press release, issued by the Roswell Army Air Field (RAAF) public information officer, stated that the field's 509th Bomb Group had recovered a crashed "flying disk" from a ranch near Roswell, New Mexico. The next day, the press reported the Commanding General of the Eighth Air Force as stating that, in fact, a radar-tracking balloon had been recovered by the RAAF personnel, not a "flying disc." A press conference was shown debris from the crashed object, which seemed to confirm the weather balloon description.

However, thirty years later, in 1978, Major Jesse Marcel, who had been involved with the original recovery of the debris, was interviewed by a ufologist, Stanton T. Friedman. In that interview, Marcel claimed that the military had covered up the recovery of an alien spacecraft. The story was rapidly embellished with allegations of further cover-ups, autopsies of alien bodies, and intimidation of witnesses.

After congressional pressure, the General Accounting Office directed the Office of the Secretary of the Air Force to conduct an investigation. This led to two reports. "The Roswell Report: Fact vs. Fiction in the New Mexico Desert" concluded that the material recovered in 1947 was probably debris from a secret government program, 'Project Mogul', which used high altitude balloons to detect sound waves generated by Soviet atomic bomb tests and ballistic missiles. The second report, released in 1997, concluded that reports of recovered alien bodies were probably a combination of mistaken memories of military accidents and of the recovery of anthropomorphic dummies in military programs, and hoaxes perpetrated by witnesses and UFO proponents.[6] The Center for UFO Studies (see below) disputes this report.[7]

Ufology

For more information, see: Ufology.

There is a movement, loosely called ufology or Ufology, that investigates and reports phenomena. Much of the reporting is anecdotal and unscientific, but some of the leadership of UFO research centers, such as Mark Rodeghier of the Center for UFO Studies (CUFOS), the Mutual UFO Network (MUFON) and French born UFO researcher Jacques Vallée, participate in much more technical discussions, such as the 1997 symposium on physical evidence from UFOs. Physicist Stanton Friedman is an established UFO researcher.[8] [9] Another is physicist Dr. Bruce Maccabee, who was a member of National Investigations Committee on Aerial Phenomena (NICAP) and who later started the Fund for UFO Research. Maccabee has investigated numerous UFO sightings including the Kennet Arnold UFO sighting, the JAL UFO sighting, the Iran Jet case in 1976 and the Gulf Breeze UFO sightings.[10] [11]

Other organizations, such as the Society for Scientific Exploration (SSE), study UFOs, but not as their sole focus. Peter Sturrock, now Emeritus Professor of Physics at Stanford University, who directed the 1997 "Physical Evidence from UFO Reports" study, "expressed the opinion that this problem will be resolved only by extensive and open professional scientific investigation, and that an essential prerequisite of such research is that more scientists acquire an interest in this topic." [12] However, Philip Klass has written that "SSE's annual conferences typically feature several pro-UFO speakers, but no UFO-skeptics. For example, at SSE's 1996 conference there were four pro-UFO speakers, but no skeptics.[13]

In June 2010, James Carrion, formerly international director of the Mutual UFO Network, set up the Center for UFO Truth, to "answer one question – did the United States and its allies purposely create the UFO myth as part of a cold war deception operation? It makes sense to include the subject of CUT's research efforts in its title." [14]

Project BLUE BOOK

A panel of the National Academy of Sciences reviewed the Condon report, and observed
"there remain UFO sightings that are not easily explained ...[but]... there seems to be no reason to attribute them to an extraterrestrial source without evidence that is much more convincing. ... On the basis of present knowledge the least likely explanation of UFOs is the hypothesis of extraterrestrial visitations by intelligent beings."[15]

In 1947, the United States Air Force began 'Project Blue Book' to collate UFO sightings. It was terminated after the Condon Report (see later) led the Secretary of the Air Force to decide there was no national security value to continuing investigations. A total of 12,618 sightings were reported to the Project, of which 701 remained "Unidentified." [16] Records of the project are in the U.S. National Archives.[4]

Central Intelligence Agency (CIA) documents indicate that the agency monitored the UFO situation from 1952.[17] In 1952, the CIA reacted to the new rash of sightings by forming a special study group within the Office of Scientific Intelligence (OSI) and the Office of Current Intelligence (OCI). Edward Tauss reported for the group that most UFO sightings could be easily explained, but recommended that the Agency continue monitoring the problem, in coordination with the Air Force Technical Intelligence Center (ATIC). He also urged that CIA conceal its interest from the media and the public, "in view of their probable alarmist tendencies".

Upon receiving the report, Deputy Director for Intelligence (DDI) Robert Amory, Jr. assigned responsibility for the UFO investigations to OSI's Physics and Electronics Division. Amory, who asked the group to focus on the national security implications of UFOs, was relaying DCI Walter Bedell Smith's concerns. Smith wanted to know whether or not the Air Force investigation of flying saucers was sufficiently objective and how much more money and manpower would be necessary to determine the cause of the small percentage of unexplained flying saucers. Smith believed "there was only one chance in 10,000 that the phenomenon posed a threat to the security of the country, but even that chance could not be taken." According to Smith, it was CIA's responsibility by statute to coordinate the intelligence effort required to solve the problem. Smith also wanted to know what use could be made of the UFO phenomenon in connection with US psychological warfare efforts.

After the BLUE BOOK report, in 1967, the Air Force issued a contract, to the University of Colorado, for the study of UFOs. The principal investigator from the University was Dr. E.U. Condon, director of the National Bureau of Standards from 1946 to 1950. The project gained some support from the Central Intelligence Agency.[18] The 'Condon Report' was published in 1969.[19]

UFO Classification

Hynek's Classification

  • Nocturnal Disks: Objects seen in the night sky. This is the most commonly reported UFO sighting.
  • Daylight Disks: UFOs that could be seen flying high in the sky or close to the ground. Oval or round disks are commonly seen with this type of UFO sighting.
  • Radar Visual: UFOs that are seen on radar screens while also being visually confirmed by eyewitnesses on the ground.
  • Close Encounter of the First Kind: UFOs that are seen within 200 yards of the witness. There is no interaction between the witness and the UFO.
  • Close Encounter of the Second Kind: Electrical equipment such as a car ignition may operate strangely. Other electrical equipment may malfunction while the UFO is present. Other forms of interaction may include physical effects to plants, animals or human beings. There could be traces of burned grass for example in a Close Encounter of the Second Kind.
  • Close Encounter of the Third Kind: Seeing humanoid like creatures associated with the UFO. There is usually no interaction between the human witness and the humanoid. In some reports there have been interactions reported between the UFO witness and the humanoids.[20]
  • Close Encounters of the Fourth Kind: Interaction between the UFO witness and abduction by humanoid entities.[21]

Jacques Vallee's UFO Classification

  • AN1: Viewing anomalous lights or explosions in the sky that do not affect the witness or the environment.
  • AN2: Reports that show lasting effects such as flattened grass, poltergeist activity or anomalous photographs.
  • AN3: Cases that include entities. This could include ghosts, yetis (Abominable Snowman), elves, spirits and cryptozoology.
  • AN4: The witness reports interaction with the entities within the reality of the entities themselves. This type of experience could include Near Death Experiences, religious visions and out-of-body experiences (OBEs).[22]

French Space Agency Classification

In 1977 the French space agency, CNES, set up a unit to record witness accounts of abnormal phenomena observed in the sky. [23] [24] They noted there is a perfectly normal explanation for the vast majority of “sightings”, such as the Moon rising, unusual clouds or space debris re-entering the atmosphere. They classified 1600 sightings into four categories:

  • Type A: Complete identification of the phenomenon
  • Type B: Probable identification.
  • Type C: Inadequate information for analysis
  • Type D: Observations are consistent and accurate but cannot be explained in terms of conventional phenomena. 9% of sightings were in this category.

In the USA, there are two well known UFO groups: the Center for UFO Studies (CUFOS) founded by J. Allen Hynek, who was the chairman of astronomy at Northwestern University, and the Mutual UFO Network (MUFON) lead by Allen Utke, Associate Professor of Chemistry at Wisconsin State University. Hynek originally doubted that the reports had any substance, but later changed his mind during his research with Project BLUE BOOK.[25]. CUFOS collects UFO reports, maintains a UFO research library, and offers two publications concerning the UFO phenomena. There are two major systems for classifying the reports, first based on shape and other visually observed characteristics, movement, and interaction with the environment or possible entities. In addition, some large data bases categorize by shape or other aspects of visual observations. Some of these classifications assume not only an object that could not be explained, but also indications of a nonhuman intelligence. [26][27]

UFOs have been reported in varying shapes and colors. According to the 'National UFO Reporting Center' (as of July 2010), 12,023 lights have been reported by witnesses, 6,020 triangles, 5,181 circles and 4,784 disks .[28] Reports in the database are transcriptions of witness self-reports and are not evaluated.[29]

The home page of the National UFO Reporting Center noted (with tongue firmly in cheek) 'Events across the United States and Canada on the evening of Sunday, July 04, 2010.'

"Over the last 48 hours, NUFORC has received almost 100 similar reports of very peculiar events, which have been witnessed across the U.S. and Canada on July 4th, and perhaps on July 3rd, as well. The sightings are a phenomenon for which we have no ready explanation. Many of the reports from both days have been submitted by seemingly serious-minded individuals, many of whom apparently witnessed the events with multiple other witnesses present. The reports are similar, in that the witnesses have described seeing strange red, orange, or yellow “fireballs,” which have been seen either to hover in the night sky, or to streak overhead, sometimes individually, and on some occasions in clusters. In some instances, the objects were observed against a clear, cloudless sky, and in other cases, they were observed below solid or broken overcast."[30]

Indeed, an exceptionally high incidence of lights in the sky had been reported on July 4, 2009, by the Mutual UFO Network.[31]

Cultural effects

UFO reports have changed over time. In the late forties, when aircraft speeds were approaching new levels such as the speed of sound, reports emphasize the speed of the object: Kenneth Arnold emphasized that his objects moved as fast as 1200 mph, a speed unattainable in 1947 but routine today. Later, when high-performance aircraft became mundane, reports more often described levitation and hovering. Does this demonstrate that UFOs are "unreal phantoms that blend in with their times?" [32] Probably, but not necessarily: it only proves that there is a cultural dimension in our assumptions about what constitutes unusual behaviour. A New York Times editorial titled "Out of This World, Out of Our Minds" observed that:

...But these days,... "The 'Modern Myth of Things Seen in the Sky' no longer resonates with the public the way it did when a tricorder or talking computers seemed miraculous," he said.[33]

Scientific consensus

In 1975, Brinsley le Poer Trench inherited the title Lord Clancarty and took up his seat in the House of Lords. In 1979, he persuaded the House to debate the subject of UFOs, believing that the public should be prepared for imminent contact with extra-terrestrials. The debate covered such issues as whether the inhabitants of other worlds have immortal souls, and allowed members of the peerage opportunities to recount their own sightings. Lord Hewlett made one of the few who represented the scientific consensus in the debate. Explaining that he had been briefed by Sir Bernard Lovell, Fellow of the Royal Society and Nuffield Professor of Radio Astronomy at Manchester University Department of Radio Astronomy and director of the Jodrell Bank radio observatory, he said:

"Of all the thousands of reports of sightings that have been made, whenever it has been possible to make an investigation they have been found to be natural phenomena, or ... pure myth. Over the United Kingdom, Jodrell Bank's radio telescope, the first and still one of the most powerful in the world, has observed thousands of possible subjects for identification as UFOs. but not a single one has proved other than natural phenomena...

He explained that the great majority of reports can be attributed to the entry into the atmosphere of meteorites or more rarely, space debris.

"Just take a tiny country like Holland. One hundred rocks the size of your fist come through the atmosphere and hit that country in one year. Consider Holland in relation to the size of the whole of the world's surface and you must surely realise that we are under constant bombardment, not with UFOs but with meteorites." [34]

References

  1. Bill Bequette (26 June 1947), Boise Flyer Maintains He Saw 'Em, Pendleton, Oregon East Oregonian
  2. Unidentified Flying Objects - Project Grudge, Technical Report No. 102-AC-49/15-100. Unidentified Flying Objects, United States Air Force Project Grudge, Technical Report No. 102-AC-49/15-100. Frequently Asked Questions, Mutual UFO Network (MUFON)
  3. Robert E. Bartholomew and Erich Goode (May-June 2000), Mass Delusions and Hysterias: Highlights from the Past Millennium, vol. 24.3, Committee for Skeptical Inquiry
  4. 4.0 4.1 Unidentified Flying Objects - Project BLUE BOOK, National Archives and Records Administration
  5. [http://www.fas.org/sgp/othergov/roswell.html Government Records: Results of a Search for Records Concerning the 1947 Crash Near Roswell, New Mexico (Letter Report, 07/28/95, GAO/NSIAD-95-187)] Government Accounting Office.
  6. The Roswell Incident, New Mexicans for Science and Reason
  7. Mark Rodeghier, The Center For UFO Studies Response To The Air Force’s 1997 Report, The Roswell Report: Case Closed, J. Allen Hynek Center for UFO Studies (CUFOS)
  8. Stanton Friedman - Biography. Retrieved on 2011-01-02.
  9. "Stanton Friedman" - Google Search. Retrieved on 2011-01-02.
  10. Dr. Bruce Maccabee Research Website. Retrieved on 2011-01-02.
  11. . Bruce Maccabee - Google Search. Retrieved on 2011-01-02.
  12. Peter Sturrock et al. (1998), "Physical Evidence from UFO Reports", Journal of Scientific Exploration 12 (2): 179-229
  13. Philip J. Klass (1 September 1998), "Best UFO Cases Fail To Provide Credible Evidence Of ET Visitors, According To Scientific Review Panel Convened By Pro-UFO Physicist", The Skeptics UFO Newsletter 53
  14. Announcements: Frequently Asked Questions, Center for UFO Truth, 28 June 2010
  15. Review of the University of Colorado Report on Unidentified Flying Objects by a Panel of the National Academy of Sciences, National Academy of Sciences, 1969
  16. U.S. Air Force Fact Sheet Concerning UFO's and Project BLUE BOOK, National Archives and Records Administration, January 1985
  17. Gerald K. Haines, "CIA's Role in the Study of UFOs, 1947-90: A Die-Hard Issue", Studies in Intelligence, Central Intelligence Agency
  18. Visit of Dr. Condon to NPIC, 20 February 1967. Retrieved on 2007-10-29.
  19. Peter Sturrock (1987), "An Analysis of the Condon Report on the Colorado UFO Project", J. Scientific Exploration 1 (1): 75
  20. http://www.cufos.org/HynekClass.html
  21. http://jacquesvallee.net/bookdocs/classif.pdf
  22. http://jacquesvallee.net/bookdocs/classif.pdf
  23. Le Geipan, the French [unidentified aerospace phenomena UAP research and information group], Centre National d'Etudes Spatiales (CNES)
  24. GEIPAN UAP investigation unit opens its files, CNES, 26 March 2007
  25. Center for UFO Studies
  26. J.Allen Hynek Center for UFO Studies
  27. Jacques F. Vallée (April 2007), A System of Classification and Reliability Indicators for the Analysis of the Behavior of Unidentified Aerial Phenomena
  28. Report Index by Shape of Craft, National UFO Report Center
  29. National UFO Reporting Center Web Reports. Retrieved on 2010-08-31.
  30. Events across the United States and Canada on the evening of Sunday, July 04, 2010, National UFO Reporting Center, 6 July 2010
  31. "UFOs spotted over 10 states during July 4th celebrations", Boston Examiner, 5 July 2009
  32. Martin S. Kottmeyer (16 July 2010 ⋅), "Why have UFOs changed speed over the years?", The Philosopher's Magazine
  33. "Out of This World, Out of Our Minds," by John Schwartz, The New York Times, editorial page, July 2, 2010, at [1]
  34. [http://hansard.millbanksystems.com/lords/1979/jan/18/unidentified-flying-objects#S5LV0397P0_19790118_HOL_432 ] from the Hansard transcript of House of Lords debate on unidentified flying objects 18th January 1979