Identifying
unidentified flying object
An unidentified flying object (UFO) is an object or phenomenon seen in the sky but not yet identified or explained. The term was coined when United States Air Force (USAF) investigations into flying saucers found too broad a range of shapes ...
s (UFOs) is a difficult task due to the normally poor quality of the evidence provided by those who report
sighting the unknown object. Observations and subsequent reporting are often made by those untrained in astronomy, atmospheric phenomena, aeronautics, physics, and perception. Nevertheless, most officially investigated UFO sightings, such as from the
U.S. Air Force's
Project Blue Book
Project Blue Book was the code name for the systematic study of unidentified flying objects (UFOs) by the United States Air Force from March 1952 to its termination on December 17, 1969. The project, headquartered at Wright-Patterson Air Fo ...
, have been identified as being due to honest misidentifications of natural phenomena, aircraft, or other prosaic explanations. In early U.S. Air Force attempts to explain UFO sightings, unexplained sightings routinely numbered over one in five reports. However, in early 1953, right after the CIA's
Robertson Panel
The Robertson Panel was a scientific committee which met in January 1953 headed by Howard P. Robertson. The Panel arose from a recommendation to the Intelligence Advisory Committee (IAC) in December 1952 from a Central Intelligence Agency (CIA) ...
, percentages of unexplained sightings dropped precipitously, usually being only a few percent in any given year. When Project Blue Book closed down in 1970, only 6% of all cases were classified as being truly unidentified.
UFOs that can be explained are sometimes termed identified flying objects (IFOs).
UFO studies
The following are some major studies undertaken during the past 70+ years that reported on identification of UFOs:
*
Project Sign
Project Sign or Project Saucer was an official U.S. government study of unidentified flying objects (UFOs) undertaken by the United States Air Force (USAF) and active for most of 1948. It was the precursor to Project Grudge.
History
The proje ...
*
Project Blue Book Special Report No. 14 (referred to further below as BBSR) was a massive statistical study the
Battelle Memorial Institute
Battelle Memorial Institute (or simply Battelle) is an American private nonprofit applied science and technology development company headquartered in Columbus, Ohio.
History
The institute was founded in 1929 by Gordon Battelle. Originall ...
did for the
USAF
The United States Air Force (USAF) is the Air force, air service branch of the United States Department of Defense. It is one of the six United States Armed Forces and one of the eight uniformed services of the United States. Tracing its ori ...
of 3,200 UFO cases between 1952 and 1954. Of these, 22% were classified as unidentified ("true UFOs"). Another 69% were deemed identified (IFOs). There was insufficient information to make a determination in the remaining 9%.
* The official French government UFO investigation (GEPAN/SEPRA), run within the French space agency
CNES
CNES () is the French national space agency. Headquartered in central Paris, the agency is overseen by the ministries of the Armed Forces, Economy and Finance and Higher Education, Research and Innovation.
It operates from the Toulouse Spac ...
between 1977 and 2004, scientifically investigated about 6000 cases and found that 13% defied any rational explanation (UFOs), while 46% were deemed readily identifiable and 41%, lacked sufficient information for classification.
* The USAF-sponsored
Condon Committee study reported that all 117 cases studied were or could probably be explained. A 1971 review of the results by the
American Institute of Aeronautics and Astronautics
The American Institute of Aeronautics and Astronautics (AIAA) is a professional society for the field of aerospace engineering
Aerospace engineering is the primary field of engineering concerned with the development of aircraft and spacecra ...
concluded that 30% of the 117 cases remained unexplained.
* Of about 5,000 cases submitted to and studied by the civilian UFO organization
NICAP
The National Investigations Committee On Aerial Phenomena (NICAP) is an unidentified flying object (UFO) research organization active in the United States from 1956 to 1980. Though NICAP no longer operates in its original form, it remains active ...
, 16% were judged unknowns.
* The
Pentagon UFO Report'','' (or colloquially known as the Pentagon UFO Report) is a United States federally mandated assessment summarizing information regarding
unidentified flying objects
An unidentified flying object (UFO) is an object or phenomenon seen in the sky but not yet identified or explained. The term was coined when United States Air Force (USAF) investigations into flying saucers found too broad a range of shape ...
(UFOs), also known as unidentified aerial phenomenon (UAPs). On June 25, 2021, a nine-page preliminary assessment was issued. It states that the UAPTF (Unidentified Aerial Phenomena Task Force) focused on 144 observations of "unidentified aerial phenomena" by the
U.S Armed Forces, mostly from
U.S. Navy
The United States Navy (USN) is the maritime service branch of the United States Department of Defense. It is the world's most powerful navy with the largest displacement, at 4.5 million tons in 2021. It has the world's largest aircraft ...
personnel, from 2004 to 2021. No details are given in the preliminary assessment. The report found that the UAPTF was unable to identify 143 of these objects, but it included five categories of potential explanations; "Airborne Clutter" includes objects like birds and balloons, "Natural Atmospheric Phenomena" includes atmospheric effect like ice crystals, "USG or Industry Developmental Programs" includes US military technology, "Foreign Adversary Systems" includes technologies developed by foreign governments such as Russia or China, and "Other", described as a "catchall" for other explanations.
* In contrast, much more conservative numbers for the percentage of UFOs were arrived at individually by astronomer
Allan Hendry, who was the chief investigator for the
Center for UFO Studies (CUFOS). CUFOS was founded by astronomer
J. Allen Hynek
Josef Allen Hynek (May 1, 1910 – April 27, 1986) was an American astronomer, professor, and ufologist. He is perhaps best remembered for his UFO research. Hynek acted as scientific advisor to UFO studies undertaken by the U.S. Air Force un ...
(who had been a consultant for the Air Force's Project Blue Book) to provide a serious scientific investigation into UFOs. Hendry spent 15 months personally investigating 1,307 UFO reports. In 1979, Hendry published his conclusions in ''The UFO Handbook: A Guide to Investigating, Evaluating, and Reporting UFO Sightings''. Hendry admitted that he would like to find evidence for extraterrestrials but noted that the vast majority of cases had prosaic explanations. He found 89% of reports definitely or probably identifiable and only 9% unidentified. "Hardcore" cases—well-documented events which defied any conceivable conventional explanation—made up only 1.5% of the reports.
Project Sign
Project Sign lists that "in order to investigate the credibility of their existence the following factors must be considered in any technical analysis":
Method of support (
lift
Lift or LIFT may refer to:
Physical devices
* Elevator, or lift, a device used for raising and lowering people or goods
** Paternoster lift, a type of lift using a continuous chain of cars which do not stop
** Patient lift, or Hoyer lift, mobile ...
)
#
Wings
# Fuselage lift (
Wingless
In cellular biology, the Wnt signaling pathways are a group of signal transduction pathways which begin with proteins that pass signals into a cell through cell surface receptors. The name Wnt, pronounced "wint", is a portmanteau created from the ...
)
#
Rotor
ROTOR was an elaborate air defence radar system built by the British Government in the early 1950s to counter possible attack by Soviet bombers. To get it operational as quickly as possible, it was initially made up primarily of WWII-era syst ...
#
Vertical Jet
#
Magnus effect
The Magnus effect is a phenomenon that occurs when a spin (geometry), spinning Object (physics), object is moving through a fluid. A lift (force), lift force acts on the spinning object and its path may be deflected in a manner not present when ...
#
Aerostatic
A subfield of fluid statics, aerostatics is the study of gases that are not in motion with respect to the coordinate system in which they are considered. The corresponding study of gases in motion is called aerodynamics.
Aerostatics studies densi ...
(lighter-than-air craft)
Method of propulsion (
thrust
Thrust is a reaction force described quantitatively by Newton's third law. When a system expels or accelerates mass in one direction, the accelerated mass will cause a force of equal magnitude but opposite direction to be applied to that ...
)
#
Propeller reciprocating engine combination jet
#
Rocket
A rocket (from , and so named for its shape) is a vehicle that uses jet propulsion to accelerate without using any surrounding air. A rocket engine produces thrust by reaction to exhaust expelled at high speed. Rocket engines work entirely ...
#
Ramjet
A ramjet is a form of airbreathing jet engine that requires forward motion of the engine to provide air for combustion. Ramjets work most efficiently at supersonic speeds around and can operate up to .
Ramjets can be particularly appropriat ...
#
Aerodynamic
Aerodynamics () is the study of the motion of atmosphere of Earth, air, particularly when affected by a solid object, such as an airplane wing. It involves topics covered in the field of fluid dynamics and its subfield of gas dynamics, and is an ...
(for example, the Katzmayer effect, defined as "the reduction in drag of an airfoil when an air stream is oscillating").
Project Blue Book Special Report No. 14
Project Blue Book Special Report No. 14 was compiled between 1951 and 1954, and included 3201 reported UFO sightings. Battelle employed four scientific analysts, who sought to divide cases into "knowns", "unknowns", and a third category of "insufficient information." They also broke down knowns and unknowns into four categories of quality, from excellent to poor. In order for a case to be deemed "identified", two analysts had to independently agree on a solution and for a case to be called "unidentified", all four analysts had to agree. A report classified as "unidentified" was defined as: "Those reports of sightings wherein the description of the object and its maneuvers could not be fitted to the pattern of any known object or phenomenon."
Out of 3,201 cases, 69% were judged to be ''identified'', 22% were ''unidentified'', and 9% had insufficient information to make a determination.
Breakdown by category of IFO and case quality
BBSR further broke these results down based on whether the identification was considered certain or merely doubtful. For example, in both the ''astronomical'' and ''aircraft'' IFO categories, 12% were considered certain and 9% were doubtful. Overall, of the 69% listed as IFOs, 42% were thought to be solved with certainty, while 27% were still considered doubtful.
In addition, if a case was lacking in adequate data, it was placed in the ''insufficient information'' category, separate from both IFOs and UFOs.
Military vs. civilian breakdown
The Battelle BBSR study included many internal military reports; 38% of the cases were designated as military. Military witnesses tended to submit better quality reports, had much fewer reports rated as having insufficient information, and had higher percentages of unknowns. As in the previous breakdown, the percentage of UFOs again rose with case quality for both the military and civilian subcategories.
In the summary table, ''best reports'' are those rated excellent and good; ''worst reports'' are doubtful and poor.
Comparison of IFOs to UFOs by characteristics
A key study of BBSR was to statistically compare IFOs and UFOs by six characteristics: color, number of objects, shape, duration of observations, speed, and light brightness. If there were no significant differences, the two classes were probably the same, the UFOs then representing merely a failure to properly identify prosaic phenomena that could already account for the IFOs. On the other hand, if the differences were statistically significant, this would suggest IFOs and UFOs were indeed distinctly different phenomena.
In the initial results, all characteristics except brightness tested significant at less or much less than 1% (brightness was greater than 5%). By removing "astronomical" sightings from the "knowns" and redoing the test, just two categories, number and speed, were significant at less than 1%, the remainder having results between 3% and 5%. This indicated that there was a statistically significant difference between the characteristics ascribed to UFOs and IFOs, but perhaps not as significant as the initial results suggested. For two characteristics, brightness and speed, the significance actually increased with the revised test.
Allan Hendry study
Like the Air Force, astronomer
Allan Hendry found that only a small percentage of cases were hoaxes and that most sightings were actually honest misidentifications of prosaic phenomena. Hendry attributed most of these to inexperience or misperception.
Out of 1,307 cases Hendry deemed 88.6% had clear prosaic explanations (IFOs) and only 8.6% were unknowns (UFOs). Of the UFOs, Hendry reported that 7.1%, might still have a prosaic explanation while 1.5% (20 cases) had no possible plausible explanation and were completely unexplained. The remaining miscellaneous cases (2.8%) were "garbage" cases, where Hendry deemed the witnesses unreliable, the reports hopelessly contradictory, or lacking in sufficient information.
Overall, in the three major categories, 42% of all cases had astronomical explanations, 37% were aircraft, and 5% were balloons. A further breakdown allowed 77% to be readily explained by five main classes of objects: 29% were bright stars or planets, 19% were advertising planes, 15% were other aircraft, 9% were meteors and reentering space debris, and 5% were balloons of various types (mostly weather or advertising balloons but also a few prank balloons).
Breakdown of cases
Hendry also used a case classification system developed by his mentor J. Allen Hynek, who established
CUFOS
The Center for UFO Studies (CUFOS) is a privately funded UFO research group. The group was founded in 1973 by J. Allen Hynek, who at the time was chair of the Department of Astronomy at Northwestern University in Illinois.Franch John, The Secret ...
, where the study was carried out. In this summary table:
* NL = "Nocturnal Lights", lights seen in the sky at night.
* DD = "Daylight Discs", objects seen in daytime (but not necessarily disc in shape).
* RV = "Radar/Visual" cases, objects observed by both witnesses and radar.
* CE = "Close Encounter" cases. For convenience, CE cases listed below are combined totals of Hynek's CE1, CE2, and CE3 cases, where:
** CE1 cases where objects were thought to be seen up close (within 500 feet).
** CE2 had purported physical interactions with the environment (physical trace cases or electromagnetic interference).
** CE3 cases were supposed to involve sightings of occupants.
Common causes of misidentification and UFOs

Both BBSR and Hendry found that three classes of objects or phenomena—astronomical, aircraft, or balloons—accounted for a large majority of identifiable UFO reports (referred to as IFOs), 86% and 83% in the two studies. For example, in Hendry's study, bright
star
A star is a luminous spheroid of plasma (physics), plasma held together by Self-gravitation, self-gravity. The List of nearest stars and brown dwarfs, nearest star to Earth is the Sun. Many other stars are visible to the naked eye at night sk ...
s and
planets
A planet is a large, rounded astronomical body that is generally required to be in orbit around a star, stellar remnant, or brown dwarf, and is not one itself. The Solar System has eight planets by the most restrictive definition of the te ...
made up 29% of all cases while
meteors
A meteor, known colloquially as a shooting star, is a glowing streak of a small body (usually meteoroid) going through Earth's atmosphere, after being heated to incandescence by collisions with air molecules in the upper atmosphere,
creating a ...
(and to a much lesser extent, re-entering space debris) made up 9%. Hovering aircraft such as helicopters or
blimps, or aircraft that appear to be hovering, such as airplanes seen at night from the front with their headlights on as they approach for landing can often confuse witnesses, as can aircraft strobe lights. BBSR reported a much higher percentage of balloons than Hendry.

Claims of misidentification are after-the-fact analyses, not direct observations, and are often misconstrued by skeptics and UFO advocates alike: They do not suggest that the experiences did not exist, but merely that they can be explained by prosaic causes. For instance, retrospective analyses of the
Jimmy Carter UFO incident of 1969 connect the sighting with the known position of the planet Venus for that time, date, and location.
Gordon Cooper
Leroy Gordon Cooper Jr. (March 6, 1927 – October 4, 2004) was an American aerospace engineer, test pilot, United States Air Force Aviator, pilot, and the youngest of the Mercury Seven, seven original astronauts in Project Mercury, the f ...
, a strong advocate of the
extraterrestrial hypothesis
The extraterrestrial hypothesis (ETH; ''synonymous with'' interplanetary aircraft ) proposes that some unidentified flying objects (UFOs) are best explained as being physical spacecraft occupied by intelligent extraterrestrial organisms ( non- ...
(ETH), claimed to have been fooled by the planet Venus when he was a fighter pilot, thinking it a distant enemy plane, and the 1967 "flying cross" of Devon, England and the 1966
Portage County UFO Chase case have both been associated with astronomical sources.
In 2009, Peter Davenport, Director of the
National UFO Reporting Center, posted this complaint online:
There are several natural and man-made objects that are commonly suggested as explanations for UFO sightings:
Venus
With the exception of the Sun, Moon and the
International Space Station
The International Space Station (ISS) is a large space station that was Assembly of the International Space Station, assembled and is maintained in low Earth orbit by a collaboration of five space agencies and their contractors: NASA (United ...
,
Venus
Venus is the second planet from the Sun. It is often called Earth's "twin" or "sister" planet for having almost the same size and mass, and the closest orbit to Earth's. While both are rocky planets, Venus has an atmosphere much thicker ...
is the brightest object in the sky and is often visible in the early morning and evening sky. Even experienced witnesses, especially when they are in unfamiliar surroundings or unusual atmospheric conditions, can fail to identify Venus correctly; however, the location of Venus is easily calculable, and professional astronomers have said that many of the UFO reports received from concerned citizens are due to observations of Venus. Astronomer
Phil Plait, in particular, has suggested that Venus is responsible for the majority of all UFO reports.
Meteors

The brightest meteors known as
bolide
A bolide is normally taken to mean an exceptionally bright meteor, but the term is subject to more than one definition, according to context. It may refer to any large Impact crater, crater-forming body, or to one that explodes in the atmosphere. ...
s are long-lasting fireballs that leave a trail in the sky which can be visible for up to an hour after passing. Such events are relatively rare but can be witnessed by a large area of the Earth since most events occur kilometers up in the atmosphere. Those witnessing such events who are not familiar with meteors can be easily fooled into thinking that the meteor is a UFO. Because meteors are not predictable with the same degree of accuracy as planets, stars, or man-made objects such as satellites, these occurrences are more difficult to prove in retrospect, though UFO sightings during meteor showers, or where there are astronomical reports of bolides, are likely to be explained as such.
Balloons, aircraft, satellites and other man-made objects
Many reports capture conventional, man-made objects. A
Skyhook balloon has been postulated as an explanation for the Mantell UFO Incident, which led to the death of
Captain Thomas Mantell.
Project Loon was a Google secret effort to bring internet services to isolated areas. Test balloons of different shapes were used and reported as UFOs. The Google Project Manager stated in an article i
Wired Magazinethat the team used UFO reports to track the balloons progress for one of the launches.
Aircraft shapes have radically changed as we continue to develop stealth technologies. These new test designs appear unusual and cause reports. The CIA released a report indicating that many UFO reports in the 1950s were classified aircraft like the SR-71 and U-2.
The increase in civilian drone usage and popularity throughout the 2010s may be moving identification of objects away from UFOs and towards drones.
Lenticular clouds

These stationary cloud formations often appear above mountains, but can happen when winds and "eddies" help shape clouds into lens shaped clouds and people see these as "flying saucers".
Misperception
Light distortion from air turbulence can cause celestial bodies to move to a limited degree as can a visual perceptual effect called the
autokinetic effect, caused by small, involuntary eye movements after staring at a star-like light against a black background without a frame of reference. To some observers, these may cause stars and planets to appear to start and stop, change direction, or dart around. Hendry and other UFO skeptics attribute complex patterns of apparent motion in UFO reports to the
autokinetic effect. Its opposite, autostasis is one of the causes as well.
Another type of misperceived motion sometimes occurs when people are driving in a vehicle. Witnesses may believe the "UFO" was following them even though the celestial body was actually stationary. Even police and other normally reliable witnesses can occasionally be fooled by sightings of bright stars and planets.
In about 10% of Hendry's cases caused by celestial bodies, witnesses greatly underestimated distances to the objects, giving distance estimates ranging from 200 feet to 125 miles (60 m to 200 km).
According to Hendry, moving clouds may also sometimes confuse observers by creating induced motion. Hendry believes this occasionally makes observers also believe objects have suddenly disappeared or make a rapid departure.
Fata Morgana

Fata Morgana is a type of
mirage
A mirage is a naturally-occurring optical phenomenon in which light rays bend via refraction to produce a displaced image of distant objects or the sky. The word comes to English via the French ''(se) mirer'', from the Latin ''mirari'', mean ...
responsible for some UFO sightings, by making objects located ''below'' the astronomical
horizon
The horizon is the apparent curve that separates the surface of a celestial body from its sky when viewed from the perspective of an observer on or near the surface of the relevant body. This curve divides all viewing directions based on whethe ...
appear to be hovering in the sky. It also magnifies images and makes them look unrecognizable.
The UFOs seen on
radar
Radar is a system that uses radio waves to determine the distance ('' ranging''), direction ( azimuth and elevation angles), and radial velocity of objects relative to the site. It is a radiodetermination method used to detect and track ...
can also be due to Fata Morgana, since water vapor in the air can create radar mirages more readily than temperature inversions can create optical mirages. According to GEPAN/SEPRA, the official UFO investigation in France,
Fata Morgana was named as a hypothesis for the mysterious Australian phenomenon
Min Min light.
Other misidentifications

The BBSR and Hendry studies identified as rare causes for UFO reports based on misidentification, such objects and phenomena as birds, light phenomena (including
mirage
A mirage is a naturally-occurring optical phenomenon in which light rays bend via refraction to produce a displaced image of distant objects or the sky. The word comes to English via the French ''(se) mirer'', from the Latin ''mirari'', mean ...
s,
moondogs,
sundogs,
auroras, ground lights such as street lights, and
searchlights reflected off of clouds), and atmospheric phenomena such as clouds, dust and fog (including unusual cloud formations such as
lenticular cloud
Lenticular clouds (, ) are stationary clouds that form mostly in the troposphere, typically in parallel alignment to the wind direction. They are often comparable in appearance to a lens or saucer. polar stratospheric cloud, Nacreous clouds tha ...
s,
noctilucent clouds, rainbow effects, and high-altitude ice crystals). Other identified causes included kites, flares, reflections off windows, and windborne debris.
Upper atmospheric lightning

More recently, Professor Colin Price head of the Geophysics and Planetary Sciences Department at
Tel Aviv University
Tel Aviv University (TAU) is a Public university, public research university in Tel Aviv, Israel. With over 30,000 students, it is the largest university in the country. Located in northwest Tel Aviv, the university is the center of teaching and ...
has commented that occurrences of
upper-atmospheric lightning
Upper-atmospheric lightning and ionospheric lightning are terms sometimes used by researchers to refer to a family of short-lived electrical-breakdown phenomena that occur well above the altitudes of normal lightning and storm clouds. Upper-atmo ...
such as
sprites,
elves
An elf (: elves) is a type of humanoid supernatural being in Germanic folklore. Elves appear especially in North Germanic mythology, being mentioned in the Icelandic ''Poetic Edda'' and the ''Prose Edda''.
In medieval Germanic-speakin ...
and
blue jets could account for some of the strange reports of UFO sightings.
Electronic warfare
According to ''
New York Magazine
''New York'' is an American biweekly magazine concerned with life, culture, politics, and style generally, with a particular emphasis on New York City.
Founded by Clay Felker and Milton Glaser in 1968 as a competitor to ''The New Yorker'' a ...
'' writer for the ''Digital Intelligencer'', Jeff Wise, advanced
electronic warfare (EW) techniques similar to early "
radar spoofing" used by the US military could deceive sensors to give false velocity and position information. Wise worries that US adversaries have developed EW capabilities that exploit weaknesses in US systems that allow information to be missed or created erroneously. Wise speculates that admitting the US has "gaps in its electronic warfare capabilities" would allow it to be looked at objectively. As Navy Spokesman Joseph Gradisher puts it, "The more data you have, the better you are to analyze it and turn that data into information into knowledge."
According to ''
Forbes
''Forbes'' () is an American business magazine founded by B. C. Forbes in 1917. It has been owned by the Hong Kong–based investment group Integrated Whale Media Investments since 2014. Its chairman and editor-in-chief is Steve Forbes. The co ...
'' contributor David Hambling, the U.S. Navy has filed patents for technology to produce a "self-focusing laser pulse to create a glowing filament or channel of plasma" that could create "mid-air images to fool infrared and other sensors". Hambling speculates that such technology "may also provide a clue about the source of some recent UFO sightings by military aircraft".
Psychological
Greg Eghigian writing for the ''
Smithsonian'' magazine suggests that, as technology has evolved, so has the nature of the UFO phenomenon. According to Eghigian, "fears of Zeppelins, rockets and drones have replaced the "celestial wonders" of ancient times", and "affairs here on earth have consistently colored our perceptions of what is going on over our heads".
According to sociologist David L. Miller, experts such as
Neil Smelser and Orrin Klapp attribute many UFO sightings to social contagion or
mass hysteria
Mass psychogenic illness (MPI), also called mass sociogenic illness, mass psychogenic disorder, epidemic hysteria or mass hysteria, involves the spread of illness symptoms through a population where there is no infectious agent responsible for c ...
, and as an overall cause of the UFO phenomenon.
See also
*
List of reported UFO sightings
This is a list of notable reported sightings of unidentified flying objects (UFOs) some of which include related claims of close encounters of the second or third kind or alien abduction. UFOs are generally considered to include any perceive ...
*
List of ufologists
*
Investigation of UFO reports by the US government
*
Project Galileo
*
Extraterrestrial hypothesis
The extraterrestrial hypothesis (ETH; ''synonymous with'' interplanetary aircraft ) proposes that some unidentified flying objects (UFOs) are best explained as being physical spacecraft occupied by intelligent extraterrestrial organisms ( non- ...
*
Interdimensional hypothesis
*
Time-traveler hypothesis
*
Cryptoterrestrial UFO hypothesis
*
The Phenomenon (2020 film)
*
UFOs in fiction
*
Fringe science
Fringe science refers to ideas whose attributes include being highly speculative or relying on premises already Objection (argument), refuted. The chance of ideas rejected by editors and published outside the mainstream being correct is remote. Wh ...
*
List of topics characterized as pseudoscience
This is a list of topics that have been characterized as pseudoscience by academics or researchers, either currently or in the past. Detailed discussion of these topics may be found on their main pages. These characterizations were made in the c ...
References
*
Allan Hendry, ''The UFO Handbook: A Guide to Investigating, Evaluating, and Reporting UFO Sightings'', 1979, Doubleday & Co.,
*
Philip Plait, ''
Bad Astronomy: Misconceptions and Misuses Revealed, from Astrology to the Moon Landing "Hoax"'', 2002 John Wiley & Sons, . (Chapter 20: Misidentified Flying Objects: UFOs and Illusions of the Mind and Eye)
*
Carl Sagan
Carl Edward Sagan (; ; November 9, 1934December 20, 1996) was an American astronomer, planetary scientist and science communicator. His best known scientific contribution is his research on the possibility of extraterrestrial life, including e ...
& Thornton Page, editors, ''UFO's: A Scientific Debate'', 1972, Cornell University Press, 1996, Barnes & Noble Books,
External links
Astronomical Causes of UFOs(
Ian Ridpath)
UFO misidentifications list and linkCommon IFO Phenomenon(Robert Moore)
Text of UFO STUDY Part 1 (UFO Investigation), gives detailed description of various IFO types(
Jenny Randles)
Google's quest to bring internet(Steven Levy)
{{UFOs
Ufology
Unidentified flying objects