147:
2191:" 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."
4089:
2056:
1925:
planets, contrails, clusters of balloons, etc. In fact, the overwhelming majority of reports that we receive now are of these normal objects and events, and processing the reports is taking a huge amount of our time... I believe the majority of time I spend on the
Hotline is devoted to trying to convince people who have been staring for hours at a star or planet that the object of interest is not a UFO.
750:
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."
1963:
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.
2003:
35:
645:. 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.
2025:, 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
2095:
high levels of water vapor, optical mirages due to water vapor are often rendered undetectable by the accompanying opaque cloud. On the other hand, radar propagation is essentially unaffected by the water droplets of the cloud so that changes in water vapor content with altitude are very effective in producing atmospheric ducting and radar mirages.
1153:
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.
749:
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,
626:
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.
2217:
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
1148:
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
2091:
As is well known, atmospheric ducting is the explanation for certain optical mirages, and in particular the arctic illusion called "fata morgana" where distant ocean or surface ice, which is essentially flat, appears to the viewer in the form of vertical columns and spires, or "castles in the air."
1962:
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
1945:
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,
625:
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
515:, 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
1896:
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
1169:
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
2198:
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
2094:
People often assume that mirages occur only rarely. This may be true of optical mirages, but conditions for radar mirages are more common, due to the role played by water vapor which strongly affects the atmospheric refractivity in relation to radio waves. Since clouds are closely associated with
2032:
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
1152:
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
1173:
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
1924:
We are receiving hundreds of reports every month of normal, terrestrial events, e.g. over-flights of the
International Space Station, the Space Shuttle, or satellites; "flares" of light from "Iridium" satellites; the appearance of typical meteors; and observations of normal, "twinkling" stars,
1128:
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
2852:
1893:, 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.
1990:
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.
1876:
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
506:
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
641:(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
3892:
365:
1149:
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.
2086:
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,
2040:
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.
519:, 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.
566:
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
617:(UFOs), also known as unidentified aerial phenomenon (UAPs). On June 25, 2021, a nine-page preliminary assessment was issued. It states that the UAPTF focused on 144 observations of "unidentified aerial phenomena" by the
578:
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
1165:
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.
2036:
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).
1982:
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 in
3713:
2249:
302:
146:
1001:
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.
2013:
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".
1909:(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
3761:
606:
1170:
miscellaneous cases (2.8%) were "garbage" cases, where Hendry deemed the witnesses unreliable, the reports hopelessly contradictory, or lacking in sufficient information.
589:
3364:
3781:
1174:
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).
4074:
2390:
327:
52:
2111:
The BBSR and Hendry studies identified as rare causes for UFO reports based on misidentification, such objects and phenomena as birds, light phenomena (including
3983:
2294:
444:
260:
4069:
3393:
2642:
3304:
660:
Project Sign lists that "in order to investigate the credibility of their existence the following factors must be considered in any technical analysis":
3756:
3937:
3791:
3033:
1994:
The increase in civilian drone usage and popularity throughout the 2010s may be moving identification of objects away from UFOs and towards drones.
2139:, rainbow effects, and high-altitude ice crystals). Other identified causes included kites, flares, reflections off windows, and windborne debris.
3662:
1946:
and professional astronomers have said that many of the UFO reports received from concerned citizens are due to observations of Venus. Astronomer
741:
459:
2331:
bservations are usually anecdotal, are not controlled in a scientific experiment, and are not accessible to study by sophisticated instruments.
993:
BBSR further broke these results down based on whether the identification was considered certain or merely doubtful. For example, in both the
3932:
3398:
99:
4118:
4092:
3379:
3264:
3038:
2752:
307:
71:
3796:
312:
2021:
Light distortion from air turbulence can cause celestial bodies to move to a limited degree as can a visual perceptual effect called the
3601:
3590:
3521:
203:
2347:
3606:
3149:
613:(or colloquially known as the Pentagon UFO Report) is a United States federally mandated assessment summarizing information regarding
393:
78:
3917:
2879:
2861:
2842:
2808:
2469:
It is worth noting that Carter himself never claimed that the sighting was anything more than an odd aerial or electrical phenomenon
2421:
2324:
1199:
CE = "Close
Encounter" cases. For convenience, CE cases listed below are combined totals of Hynek's CE1, CE2, and CE3 cases, where:
118:
3159:
2556:
2779:
85:
4053:
3431:
3043:
3224:
3164:
3001:
2986:
2956:
2918:
2383:
2239:
2131:
reflected off of clouds), and atmospheric phenomena such as clouds, dust and fog (including unusual cloud formations such as
439:
434:
218:
154:
56:
67:
3847:
3842:
3682:
3475:
3374:
3144:
2723:"How to Decipher the Pentagon's UFO Report The crucial, missing context for what military pilots might actually be seeing"
1917:
485:
2456:
3566:
3114:
3006:
2798:
2521:
2269:
731:(for example, the Katzmayer effect, defined as "the reduction in drag of an airfoil when an air stream is oscillating").
208:
183:
4048:
3827:
3822:
3736:
3718:
3129:
3084:
3058:
2264:
2259:
2208:
2188:
2164:
2152:
1938:
1906:
614:
559:
292:
193:
163:
1205:
CE2 had purported physical interactions with the environment (physical trace cases or electromagnetic interference).
3541:
3491:
3486:
3426:
3408:
3369:
3294:
3239:
2965:
2279:
588:
study reported that all 117 cases studied were or could probably be explained. A 1971 review of the results by the
538:
The following are some major studies undertaken during the past 70+ years that reported on identification of UFOs:
499:
413:
228:
134:
3289:
629:
In contrast, much more conservative numbers for the percentage of UFOs were arrived at individually by astronomer
45:
3995:
3927:
3446:
3324:
3219:
3214:
3079:
1898:
1129:
breakdown, the percentage of UFOs again rose with case quality for both the military and civilian subcategories.
429:
238:
2639:
3922:
3501:
3496:
3481:
3441:
3309:
3244:
3234:
1929:
There are several natural and man-made objects that are commonly suggested as explanations for UFO sightings:
1910:
1889:(and to a much lesser extent, re-entering space debris) made up 9%. Hovering aircraft such as helicopters or
3857:
3832:
3596:
3581:
3576:
3571:
3556:
3531:
3526:
3511:
3506:
3471:
3359:
3350:
3249:
3094:
3027:
1901:
of 1969 connect the sighting with the known position of the planet Venus for that time, date, and location.
388:
336:
92:
3586:
3561:
3551:
3536:
3516:
3421:
3299:
3274:
3259:
3199:
3184:
3169:
3104:
3089:
634:
223:
168:
502:(UFOs) is a difficult task due to the normally poor quality of the evidence provided by those who report
4030:
3546:
3416:
3329:
3314:
3189:
3179:
3074:
2060:
2050:
1182:
Hendry also used a case classification system developed by his mentor J. Allen Hynek, who established
3741:
3622:
3284:
3279:
3254:
3229:
3209:
3124:
3109:
2214:
1976:
1309:
277:
272:
198:
178:
3451:
3048:
2722:
2156:
2148:
248:
2661:"The Min Min light and the Fata Morgana. An optical account of a mysterious Australian phenomenon"
4000:
3812:
3697:
3174:
3022:
2949:
2622:
2594:
2352:
2244:
2184:
2147:
More recently, Professor Colin Price head of the Geophysics and Planetary Sciences Department at
2124:
2026:
2022:
454:
2079:
appear to be hovering in the sky. It also magnifies images and makes them look unrecognizable.
3963:
3746:
3154:
2875:
2857:
2838:
2804:
2730:
2682:
2614:
2427:
2417:
2320:
2176:
2136:
1975:
has been postulated as an explanation for the Mantell UFO Incident, which led to the death of
746:
550:
512:
478:
383:
322:
213:
2919:
Text of UFO STUDY Part 1 (UFO Investigation), gives detailed description of various IFO types
2853:
Bad Astronomy: Misconceptions and Misuses Revealed, from Astrology to the Moon Landing "Hoax"
1950:, in particular, has suggested that Venus is responsible for the majority of all UFO reports
4113:
3766:
3687:
3319:
3099:
2672:
2606:
2361:
2132:
2006:
618:
584:
317:
233:
173:
4020:
3968:
3942:
3909:
3776:
3751:
3652:
3647:
3642:
3269:
3194:
3134:
3119:
3053:
2646:
2525:
2284:
2254:
1972:
516:
398:
297:
188:
2414:
The UFO handbook : a guide to investigating, evaluating, and reporting UFO sightings
17:
3958:
3731:
3334:
3139:
2677:
2660:
2289:
1987:
that the team used UFO reports to track the balloons progress for one of the launches.
638:
508:
243:
2928:
2457:
https://digital.library.unt.edu/ark:/67531/metadc53897/m2/1/high_res_d/19930081006.pdf
2063:
of a boat below the horizon produces the illusion of a solid form floating in the sky.
1984:
4107:
3870:
3692:
3637:
3627:
2942:
2922:
2226:
2100:
1902:
693:
2864:. (Chapter 20: Misidentified Flying Objects: UFOs and Illusions of the Mind and Eye)
2626:
2581:
2055:
4025:
3887:
3771:
3726:
3672:
2847:
2835:
The UFO Handbook: A Guide to Investigating, Evaluating, and Reporting UFO Sightings
2830:
2222:
2128:
1193:
DD = "Daylight Discs", objects seen in daytime (but not necessarily disc in shape).
1162:
677:
655:
643:
The UFO Handbook: A Guide to Investigating, Evaluating, and Reporting UFO Sightings
630:
543:
471:
374:
360:
287:
2444:
3978:
3817:
3632:
3436:
3388:
3204:
2896:
2480:
2467:
2343:
2274:
2099:
Fata Morgana was named as a hypothesis for the mysterious Australian phenomenon
2002:
1586:
728:
698:
408:
355:
34:
595:
Of about 5,000 cases submitted to and studied by the civilian UFO organization
3882:
3677:
2892:
2867:
2610:
1947:
664:
403:
2518:
3973:
3877:
3837:
2907:
2700:
2160:
683:
622:
350:
2686:
2431:
1202:
CE1 cases where objects were thought to be seen up close (within 500 feet).
2912:
2618:
2199:
clue about the source of some recent UFO sightings by military aircraft".
1004:
In addition, if a case was lacking in adequate data, it was placed in the
2116:
1582:
503:
2800:
Introduction to Collective Behavior and Collective Action: Third Edition
1196:
RV = "Radar/Visual" cases, objects observed by both witnesses and radar.
4075:
Unidentified Anomalous Phenomena Disclosure Act (UADPA), USA law (2023)
3865:
2976:
2120:
2076:
1886:
1882:
1785:(insufficient information, inconsistent accounts, unreliable witnesses)
713:
345:
138:
2500:
3988:
2757:
2195:
2112:
2068:
1959:
1890:
1578:
723:
718:
706:
282:
2225:
and Orrin Klapp attribute many UFO sightings to social contagion or
2874:, 1972, Cornell University Press, 1996, Barnes & Noble Books,
2083:
2054:
1942:
1183:
671:
597:
3762:
National Investigations Committee On Aerial Phenomena (1956–1980)
2167:
could account for some of the strange reports of UFO sightings.
1878:
1616:
688:
575:
563:
2938:
761:, and 9% had insufficient information to make a determination.
2902:
2071:
responsible for some UFO sightings, by making objects located
28:
3782:
Advanced Aerospace Threat Identification Program (2007–2012)
3714:
Investigation of UFO reports by the United States government
2501:"The Portage County, Ohio, UFO Chase – UFO Casebook Files"
2221:
According to sociologist David L. Miller, experts such as
1913:
case have both been associated with astronomical sources.
1208:
CE3 cases were supposed to involve sightings of occupants.
1186:, where the study was carried out. In this summary table:
2780:"How UFO Reports Change With the Technology of the Times"
2029:. Its opposite, autostasis is one of the causes as well.
1967:
Balloons, aircraft, satellites and other man-made objects
1190:
NL = "Nocturnal Lights", lights seen in the sky at night.
592:
concluded that 30% of the 117 cases remained unexplained.
2934:
2519:
National UFO Reporting Center Statement August 30, 2009
2384:"Preliminary Assessment: Unidentified Aerial Phenomena"
2009:
have been reported as UFOs due to their peculiar shape.
1971:
Many reports capture conventional, man-made objects. A
1026:
1023:
1020:
768:
2319:. Brooks/Cole div. of Thomson Learning. p. 428.
1015:
328:
Unidentified Anomalous Phenomena Disclosure Act - US
4062:
4041:
4013:
3951:
3908:
3901:
3856:
3805:
3706:
3661:
3615:
3464:
3407:
3343:
3067:
3015:
2994:
2985:
59:. Unsourced material may be challenged and removed.
3792:Unidentified Aerial Phenomena Task Force (current)
590:American Institute of Aeronautics and Astronautics
2250:Investigation of UFO reports by the US government
2229:, and as an overall cause of the UFO phenomenon.
570:The official French government UFO investigation
522:UFOs that can be explained are sometimes termed
422:Lists of organizations, sightings, studies, etc.
2595:"A Case of "Autostasis" or Reverse Autokinesis"
2391:Office of the Director of National Intelligence
2089:
1922:
4070:United States Congress hearings on UFOs (2022)
2416:(1st ed.). Garden City, N.Y.: Doubleday.
1619:, flares, reflections, windblown debris, etc.)
714:Propeller reciprocating engine combination jet
2950:
2315:Pasachoff, Jay M and Alex Filippenko (2004).
2295:List of topics characterized as pseudoscience
1144:Comparison of IFOs to UFOs by characteristics
765:Breakdown by category of IFO and case quality
479:
8:
2701:"A sprightly explanation for UFO sightings?"
1937:With the exception of the sun, moon and the
1008:category, separate from both IFOs and UFOs.
2317:The Cosmos: Astronomy in the New Millennium
2127:, ground lights such as street lights, and
1872:Common causes of misidentification and UFOs
3905:
2991:
2957:
2943:
2935:
2908:IFO cases caused by stratospheric balloons
1916:In 2009, Peter Davenport, Director of the
753:Out of 3,201 cases, 69% were judged to be
486:
472:
130:
2676:
637:(CUFOS). CUFOS was founded by astronomer
633:, who was the chief investigator for the
308:All-domain Anomaly Resolution Office - US
303:History of government investigations - US
119:Learn how and when to remove this message
3044:1665 celestial phenomenon over Stralsund
3034:1561 celestial phenomenon over Nuremberg
2001:
1286:meteors, re-entering man-made spacecraft
1213:
2753:"U.S. Navy Laser Creates Plasma 'UFOs'"
2307:
747:Project Blue Book Special Report No. 14
742:Project Blue Book Special Report No. 14
736:Project Blue Book Special Report No. 14
551:Project Blue Book Special Report No. 14
421:
373:
335:
256:
153:
133:
3180:Barney and Betty Hill abduction (1961)
558:) was a massive statistical study the
313:NASA's UAP independent study team - US
574:, run within the French space agency
445:Investigations of UFOs by governments
7:
3039:1566 celestial phenomenon over Basel
2903:UFO misidentifications list and link
2555:Greenwood, Faine (16 January 2019).
1136:are those rated excellent and good;
57:adding citations to reliable sources
2797:Miller, David L. (August 6, 2013).
2665:Clinical and Experimental Optometry
2557:"Drones Are the New Flying Saucers"
3737:Flying Saucer Working Party (1950)
3394:High-altitude object events (2023)
3023:Ezekiel's Wheel (circa 622–570 BC)
2678:10.1111/j.1444-0938.2003.tb03069.x
2151:has commented that occurrences of
25:
3797:NASA's UAP independent study team
337:Other Relevant Stories and Topics
4088:
4087:
2929:Google's quest to bring internet
2703:. Physorg.com. February 23, 2009
2481:"Devon flying cross UFO of 1967"
2275:Cryptoterrestrial UFO hypothesis
1920:, posted this complaint online:
293:Flying Saucer Working Party - UK
145:
68:"Identification studies of UFOs"
33:
4054:Committee for Skeptical Inquiry
3235:John Lennon UFO incident (1974)
3049:José Bonilla observation (1883)
2803:. Waveland Press. p. 174.
1958:The brightest meteors known as
1885:made up 29% of all cases while
1161:Like the Air Force, astronomer
1012:Military vs. civilian breakdown
460:Alleged extraterrestrial beings
44:needs additional citations for
3787:Identification studies of UFOs
3265:Valentich disappearance (1978)
3250:Petrozavodsk phenomenon (1977)
3130:McMinnville photographs (1950)
3002:List of reported UFO sightings
2870:& Thornton Page, editors,
2856:, 2002 John Wiley & Sons,
2240:List of reported UFO sightings
2213:Greg Eghigian writing for the
554:(referred to further below as
450:Identification studies of UFOs
1:
3747:Project Blue Book (1952–1970)
3427:Aztec, New Mexico hoax (1949)
3422:Twin Falls, Idaho hoax (1947)
3275:Robert Taylor incident (1979)
3240:Travis Walton incident (1975)
3185:Lonnie Zamora incident (1964)
3080:Ă„ngelholm UFO memorial (1946)
2837:, 1979, Doubleday & Co.,
2187:techniques similar to early "
1918:National UFO Reporting Center
3290:Cash–Landrum incident (1980)
3190:Solway Firth Spaceman (1964)
3165:Lakenheath-Bentwaters (1956)
2640:Electromagnetic-Wave Ducting
2593:Wertheimer, Michael (1968).
2348:"UFO Identification Process"
4119:Unidentified flying objects
4049:List of scientific skeptics
3777:Project Condign (1997–2000)
3720:The Flying Saucers Are Real
3280:Val Johnson incident (1979)
3230:Pascagoula Abduction (1973)
2893:Astronomical Causes of UFOs
2599:Perceptual and Motor Skills
2265:Interdimensional hypothesis
2260:Extraterrestrial hypothesis
2209:psychosocial UFO hypothesis
2153:upper-atmospheric lightning
2143:Upper atmospheric lightning
1939:International Space Station
1907:extraterrestrial hypothesis
1905:, a strong advocate of the
615:unidentified flying objects
601:, 16% were judged unknowns.
560:Battelle Memorial Institute
500:unidentified flying objects
288:Institute 22 - Soviet Union
4135:
3742:Project Magnet (1950–1962)
3399:David Grusch claims (2023)
3170:AntĂ´nio Villas Boas (1957)
2872:UFO's: A Scientific Debate
2721:Wise, Jeff (3 July 2021).
2360:(6): 34–37. Archived from
2280:The Phenomenon (2020 film)
2206:
2067:Fata Morgana is a type of
2048:
1018:
739:
653:
414:Unarius Academy of Science
4083:
3767:Condon Report (1966–1968)
3447:Alien Autopsy (1995 film)
3260:Zanfretta incident (1978)
3160:Kelly–Hopkinsville (1955)
2972:
2611:10.2466/pms.1968.26.2.417
1899:Jimmy Carter UFO incident
1027:Insufficient Information
524:identified flying objects
261:Government investigations
3417:Maury Island hoax (1947)
3315:Voronezh incident (1989)
3300:Trans-en-Provence (1981)
3295:Rendlesham Forest (1980)
3225:Finnish Air Force (1969)
3155:Flatwoods monster (1952)
3007:Sightings in outer space
2346:; McGaha, James (2018).
2270:Time-traveler hypothesis
2107:Other misidentifications
1911:Portage County UFO Chase
1006:insufficient information
952:Insufficient information
701:(lighter-than-air craft)
209:Sightings in outer space
18:Identified flying object
3665:extraterrestrial beings
3432:Southern England (1967)
3360:Campeche, Mexico (2004)
3320:Belgian UFO wave (1990)
3150:Washington, D.C. (1952)
3145:Nash-Fortenberry (1952)
3028:Airship of Clonmacnoise
2659:Pettigrew, JD. (2003).
2412:Hendry, Allan. (1979).
1263:bright stars or planets
1140:are doubtful and poor.
389:Church of the SubGenius
278:Project Magnet - Canada
273:Operação Prato - Brazil
164:Kenneth Arnold sighting
3752:Robertson Panel (1953)
3305:Japan Air Lines (1986)
3270:Kaikoura Lights (1978)
3120:Gorman Dogfight (1948)
3054:Airship wave (1896–97)
2536:Paschoff and Filipenko
2524:April 8, 2013, at the
2183:, Jeff Wise, advanced
2097:
2064:
2010:
1977:Captain Thomas Mantell
1927:
1132:In the summary table,
705:Method of propulsion (
635:Center for UFO Studies
435:Reported UFO sightings
323:Project Blue Book - US
3772:Institute 22 (1978–?)
3757:Ruppelt report (1956)
3732:Project Grudge (1949)
3442:Gulf Breeze (1987–88)
3389:Jetpack man (2020–21)
3365:O'Hare Airport (2006)
3335:Phoenix Lights (1997)
3255:Operação Prato (1977)
3140:Lubbock Lights (1951)
3115:Chiles-Whitted (1948)
3085:Kenneth Arnold (1947)
2913:Common IFO Phenomenon
2729:. The Intelligencer,
2582:How stars become UFOs
2181:Digital Intelligencer
2058:
2051:Fata Morgana (mirage)
2005:
1310:artificial satellites
772:Category/Case Quality
318:Condon Committee - US
219:Barney and Betty Hill
4063:Government & Law
3984:Government responses
3465:Sightings by country
3384:UFO incidents (2014)
2784:Smithsonian Magazine
2215:Smithsonian Magazine
440:Sightings by country
298:Project Condign - UK
53:improve this article
3858:Conspiracy theories
3848:Trotskyist-Posadism
3727:Project Sign (1948)
3698:Reptilian humanoids
3355:UFO incident (2004)
3325:Ariel School (1994)
3220:Jimmy Carter (1969)
3215:Shag Harbour (1967)
2149:Tel Aviv University
2033:stars and planets.
663:Method of support (
607:Pentagon UFO Report
582:The USAF-sponsored
249:Pentagon UFO videos
3813:Ancient astronauts
3437:Majestic 12 (1985)
3382:Theodore Roosevelt
3310:Ilkley Moor (1987)
3210:Falcon Lake (1967)
3075:Los Angeles (1942)
2645:2008-10-22 at the
2517:Davenport, Peter.
2353:Skeptical Inquirer
2245:List of Ufologists
2185:Electronic Warfare
2171:Electronic Warfare
2137:noctilucent clouds
2065:
2027:autokinetic effect
2023:autokinetic effect
2011:
1715:Total Unidentified
1403:advertising planes
1178:Breakdown of cases
1157:Allan Hendry study
892:Clouds, dust, etc.
239:Alien autopsy hoax
194:McMinnville photos
4101:
4100:
4009:
4008:
3964:Cattle mutilation
3818:Cryptoterrestrial
3460:
3459:
3452:Morristown (2009)
3095:Flight 105 (1947)
2987:Claimed sightings
2751:Hambling, David.
2731:New York Magazine
2649:BY V. R. ESHLEMAN
2177:New York Magazine
2133:lenticular clouds
2082:The UFOs seen on
2075:the astronomical
2007:Lenticular clouds
1998:Lenticular clouds
1869:
1868:
1585:, ground lights,
1357:TOTAL (all cases)
1126:
1125:
991:
990:
513:Project Blue Book
496:
495:
430:UFO organizations
384:Aetherius Society
229:Rendlesham Forest
214:Flatwoods monster
155:Notable sightings
129:
128:
121:
103:
16:(Redirected from
4126:
4091:
4090:
3910:Abduction claims
3906:
3828:Interdimensional
3823:Extraterrestrial
3688:Little green men
3663:Types of alleged
3409:Confirmed hoaxes
3200:Kecksburg (1965)
3175:Levelland (1957)
3016:Pre-20th century
2992:
2959:
2952:
2945:
2936:
2822:
2821:
2819:
2817:
2794:
2788:
2787:
2776:
2770:
2769:
2767:
2765:
2748:
2742:
2741:
2739:
2737:
2718:
2712:
2711:
2709:
2708:
2697:
2691:
2690:
2680:
2656:
2650:
2637:
2631:
2630:
2590:
2584:
2578:
2572:
2571:
2569:
2567:
2552:
2546:
2543:
2537:
2534:
2528:
2515:
2509:
2508:
2497:
2491:
2490:
2488:
2487:
2476:
2470:
2465:
2459:
2454:
2448:
2442:
2436:
2435:
2409:
2403:
2402:
2400:
2398:
2388:
2380:
2374:
2373:
2371:
2369:
2340:
2334:
2333:
2312:
1647:Total Identified
1449:missile launches
1214:
1016:
769:
619:U.S Armed Forces
585:Condon Committee
488:
481:
474:
149:
131:
124:
117:
113:
110:
104:
102:
61:
37:
29:
21:
4134:
4133:
4129:
4128:
4127:
4125:
4124:
4123:
4104:
4103:
4102:
4097:
4079:
4058:
4037:
4005:
3969:Close encounter
3947:
3897:
3852:
3801:
3702:
3664:
3657:
3653:Space jellyfish
3648:Mystery airship
3643:Green fireballs
3611:
3456:
3403:
3370:Alderney (2007)
3339:
3330:Varginha (1996)
3063:
3011:
2981:
2968:
2963:
2889:
2884:
2826:
2825:
2815:
2813:
2811:
2796:
2795:
2791:
2778:
2777:
2773:
2763:
2761:
2750:
2749:
2745:
2735:
2733:
2720:
2719:
2715:
2706:
2704:
2699:
2698:
2694:
2658:
2657:
2653:
2647:Wayback Machine
2638:
2634:
2592:
2591:
2587:
2579:
2575:
2565:
2563:
2554:
2553:
2549:
2544:
2540:
2535:
2531:
2526:Wayback Machine
2516:
2512:
2505:ufocasebook.com
2499:
2498:
2494:
2485:
2483:
2478:
2477:
2473:
2466:
2462:
2455:
2451:
2443:
2439:
2424:
2411:
2410:
2406:
2396:
2394:
2393:. June 25, 2021
2386:
2382:
2381:
2377:
2367:
2365:
2342:
2341:
2337:
2327:
2314:
2313:
2309:
2304:
2299:
2285:UFOs in fiction
2255:Project Galileo
2235:
2211:
2205:
2179:writer for the
2173:
2145:
2109:
2093:
2053:
2047:
2019:
2000:
1973:Skyhook balloon
1969:
1956:
1935:
1874:
1809:Total all cases
1575:light phenomena
1180:
1159:
1146:
1014:
852:Light phenomena
767:
744:
738:
676:Fuselage lift (
658:
652:
579:classification.
536:
517:Robertson Panel
492:
399:Nation of Islam
283:GEIPAN - France
265:
189:Gorman dogfight
125:
114:
108:
105:
62:
60:
50:
38:
23:
22:
15:
12:
11:
5:
4132:
4130:
4122:
4121:
4116:
4106:
4105:
4099:
4098:
4096:
4095:
4084:
4081:
4080:
4078:
4077:
4072:
4066:
4064:
4060:
4059:
4057:
4056:
4051:
4045:
4043:
4039:
4038:
4036:
4035:
4034:
4033:
4023:
4017:
4015:
4011:
4010:
4007:
4006:
4004:
4003:
3998:
3993:
3992:
3991:
3981:
3976:
3971:
3966:
3961:
3955:
3953:
3949:
3948:
3946:
3945:
3940:
3935:
3930:
3925:
3920:
3914:
3912:
3903:
3899:
3898:
3896:
3895:
3890:
3885:
3880:
3875:
3874:
3873:
3862:
3860:
3854:
3853:
3851:
3850:
3845:
3843:Time-traveller
3840:
3835:
3830:
3825:
3820:
3815:
3809:
3807:
3803:
3802:
3800:
3799:
3794:
3789:
3784:
3779:
3774:
3769:
3764:
3759:
3754:
3749:
3744:
3739:
3734:
3729:
3724:
3716:
3710:
3708:
3704:
3703:
3701:
3700:
3695:
3690:
3685:
3680:
3675:
3669:
3667:
3659:
3658:
3656:
3655:
3650:
3645:
3640:
3635:
3630:
3625:
3623:Black triangle
3619:
3617:
3613:
3612:
3610:
3609:
3604:
3602:United Kingdom
3599:
3594:
3591:Canary Islands
3584:
3579:
3574:
3569:
3564:
3559:
3554:
3549:
3544:
3539:
3534:
3529:
3524:
3522:Czech Republic
3519:
3514:
3509:
3504:
3499:
3494:
3489:
3484:
3479:
3468:
3466:
3462:
3461:
3458:
3457:
3455:
3454:
3449:
3444:
3439:
3434:
3429:
3424:
3419:
3413:
3411:
3405:
3404:
3402:
3401:
3396:
3391:
3386:
3377:
3372:
3367:
3362:
3357:
3347:
3345:
3341:
3340:
3338:
3337:
3332:
3327:
3322:
3317:
3312:
3307:
3302:
3297:
3292:
3287:
3285:Manises (1979)
3282:
3277:
3272:
3267:
3262:
3257:
3252:
3247:
3242:
3237:
3232:
3227:
3222:
3217:
3212:
3207:
3205:Westall (1966)
3202:
3197:
3192:
3187:
3182:
3177:
3172:
3167:
3162:
3157:
3152:
3147:
3142:
3137:
3132:
3127:
3125:Mariana (1950)
3122:
3117:
3112:
3110:Mantell (1948)
3107:
3102:
3100:Roswell (1947)
3097:
3092:
3087:
3082:
3077:
3071:
3069:
3065:
3064:
3062:
3061:
3056:
3051:
3046:
3041:
3036:
3031:
3025:
3019:
3017:
3013:
3012:
3010:
3009:
3004:
2998:
2996:
2989:
2983:
2982:
2980:
2979:
2973:
2970:
2969:
2964:
2962:
2961:
2954:
2947:
2939:
2933:
2932:
2926:
2916:
2915:(Robert Moore)
2910:
2905:
2900:
2888:
2887:External links
2885:
2883:
2882:
2865:
2845:
2827:
2824:
2823:
2809:
2789:
2771:
2743:
2713:
2692:
2651:
2632:
2605:(2): 417–418.
2585:
2580:Ridpath, Ian.
2573:
2547:
2538:
2529:
2510:
2492:
2471:
2460:
2449:
2437:
2422:
2404:
2375:
2335:
2325:
2306:
2305:
2303:
2300:
2298:
2297:
2292:
2290:Fringe science
2287:
2282:
2277:
2272:
2267:
2262:
2257:
2252:
2247:
2242:
2236:
2234:
2231:
2207:Main article:
2204:
2201:
2189:radar spoofing
2172:
2169:
2144:
2141:
2108:
2105:
2049:Main article:
2046:
2043:
2018:
2015:
1999:
1996:
1985:Wired Magazine
1968:
1965:
1955:
1952:
1934:
1931:
1873:
1870:
1867:
1866:
1863:
1860:
1857:
1854:
1851:
1847:
1846:
1843:
1840:
1837:
1834:
1831:
1828:
1824:
1823:
1821:
1819:
1817:
1815:
1813:
1811:
1805:
1804:
1801:
1800:
1797:
1794:
1792:
1790:
1788:
1786:
1779:
1778:
1775:
1774:
1772:
1769:
1766:
1763:
1760:
1757:
1753:
1752:
1749:
1746:
1743:
1740:
1737:
1734:
1730:
1729:
1727:
1725:
1723:
1721:
1719:
1717:
1711:
1710:
1707:
1706:
1704:
1701:
1698:
1695:
1692:
1689:
1685:
1684:
1681:
1678:
1675:
1672:
1669:
1666:
1662:
1661:
1659:
1657:
1655:
1653:
1651:
1649:
1643:
1642:
1639:
1638:
1635:
1632:
1629:
1626:
1623:
1620:
1609:
1608:
1605:
1602:
1599:
1596:
1593:
1590:
1571:
1570:
1567:
1564:
1561:
1558:
1555:
1552:
1546:
1545:
1542:
1539:
1536:
1533:
1530:
1527:
1521:
1520:
1517:
1514:
1511:
1508:
1505:
1502:
1496:
1495:
1492:
1491:
1488:
1485:
1482:
1479:
1476:
1473:
1469:
1468:
1465:
1462:
1459:
1456:
1453:
1450:
1446:
1445:
1442:
1439:
1436:
1433:
1430:
1427:
1426:other aircraft
1423:
1422:
1419:
1416:
1413:
1410:
1407:
1404:
1400:
1399:
1397:
1395:
1393:
1391:
1389:
1387:
1381:
1380:
1377:
1376:
1373:
1370:
1367:
1364:
1361:
1358:
1354:
1353:
1350:
1347:
1344:
1341:
1338:
1335:
1331:
1330:
1327:
1324:
1321:
1318:
1315:
1312:
1306:
1305:
1302:
1299:
1296:
1293:
1290:
1287:
1283:
1282:
1279:
1276:
1273:
1270:
1267:
1264:
1260:
1259:
1257:
1255:
1253:
1251:
1249:
1247:
1241:
1240:
1237:
1236:
1233:
1230:
1227:
1224:
1221:
1218:
1212:
1211:
1210:
1209:
1206:
1203:
1197:
1194:
1191:
1179:
1176:
1158:
1155:
1145:
1142:
1124:
1123:
1120:
1117:
1114:
1111:
1108:
1105:
1102:
1099:
1096:
1092:
1091:
1088:
1085:
1082:
1079:
1076:
1073:
1070:
1067:
1064:
1060:
1059:
1056:
1053:
1050:
1047:
1044:
1041:
1038:
1035:
1032:
1029:
1028:
1025:
1022:
1019:
1013:
1010:
989:
988:
985:
982:
979:
976:
973:
972:Unknown origin
969:
968:
965:
962:
959:
956:
953:
949:
948:
945:
942:
939:
936:
933:
929:
928:
925:
922:
919:
916:
913:
909:
908:
905:
902:
899:
896:
893:
889:
888:
885:
882:
879:
876:
873:
869:
868:
865:
862:
859:
856:
853:
849:
848:
845:
842:
839:
836:
833:
829:
828:
825:
822:
819:
816:
813:
809:
808:
805:
802:
799:
796:
793:
789:
788:
785:
782:
779:
776:
773:
766:
763:
740:Main article:
737:
734:
733:
732:
726:
721:
716:
703:
702:
696:
691:
686:
681:
674:
654:Main article:
651:
648:
647:
646:
639:J. Allen Hynek
627:
621:, mostly from
602:
593:
580:
568:
547:
535:
532:
509:U.S. Air Force
494:
493:
491:
490:
483:
476:
468:
465:
464:
463:
462:
457:
452:
447:
442:
437:
432:
424:
423:
419:
418:
417:
416:
411:
406:
401:
396:
391:
386:
378:
377:
371:
370:
369:
368:
363:
358:
353:
348:
340:
339:
333:
332:
331:
330:
325:
320:
315:
310:
305:
300:
295:
290:
285:
280:
275:
267:
266:
264:
263:
257:
254:
253:
252:
251:
246:
244:Phoenix Lights
241:
236:
231:
226:
221:
216:
211:
206:
201:
196:
191:
186:
184:Chiles-Whitted
181:
176:
171:
166:
158:
157:
151:
150:
142:
141:
127:
126:
41:
39:
32:
24:
14:
13:
10:
9:
6:
4:
3:
2:
4131:
4120:
4117:
4115:
4112:
4111:
4109:
4094:
4086:
4085:
4082:
4076:
4073:
4071:
4068:
4067:
4065:
4061:
4055:
4052:
4050:
4047:
4046:
4044:
4040:
4032:
4029:
4028:
4027:
4024:
4022:
4019:
4018:
4016:
4012:
4002:
3999:
3997:
3996:Organizations
3994:
3990:
3987:
3986:
3985:
3982:
3980:
3977:
3975:
3972:
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3916:
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3913:
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3907:
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3900:
3894:
3893:Project Serpo
3891:
3889:
3886:
3884:
3881:
3879:
3876:
3872:
3871:Storm Area 51
3869:
3868:
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3864:
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3859:
3855:
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3808:
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3735:
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3730:
3728:
3725:
3723:
3721:
3717:
3715:
3712:
3711:
3709:
3705:
3699:
3696:
3694:
3693:Nordic aliens
3691:
3689:
3686:
3684:
3681:
3679:
3676:
3674:
3673:Energy beings
3671:
3670:
3668:
3666:
3660:
3654:
3651:
3649:
3646:
3644:
3641:
3639:
3638:Ghost rockets
3636:
3634:
3631:
3629:
3628:Flying saucer
3626:
3624:
3621:
3620:
3618:
3616:Types of UFOs
3614:
3608:
3607:United States
3605:
3603:
3600:
3598:
3595:
3592:
3588:
3585:
3583:
3580:
3578:
3575:
3573:
3570:
3568:
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3525:
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3515:
3513:
3510:
3508:
3505:
3503:
3500:
3498:
3495:
3493:
3490:
3488:
3485:
3483:
3480:
3477:
3473:
3470:
3469:
3467:
3463:
3453:
3450:
3448:
3445:
3443:
3440:
3438:
3435:
3433:
3430:
3428:
3425:
3423:
3420:
3418:
3415:
3414:
3412:
3410:
3406:
3400:
3397:
3395:
3392:
3390:
3387:
3385:
3383:
3378:
3376:
3375:Norway (2009)
3373:
3371:
3368:
3366:
3363:
3361:
3358:
3356:
3354:
3349:
3348:
3346:
3342:
3336:
3333:
3331:
3328:
3326:
3323:
3321:
3318:
3316:
3313:
3311:
3308:
3306:
3303:
3301:
3298:
3296:
3293:
3291:
3288:
3286:
3283:
3281:
3278:
3276:
3273:
3271:
3268:
3266:
3263:
3261:
3258:
3256:
3253:
3251:
3248:
3246:
3245:Tehran (1976)
3243:
3241:
3238:
3236:
3233:
3231:
3228:
3226:
3223:
3221:
3218:
3216:
3213:
3211:
3208:
3206:
3203:
3201:
3198:
3196:
3195:Exeter (1965)
3193:
3191:
3188:
3186:
3183:
3181:
3178:
3176:
3173:
3171:
3168:
3166:
3163:
3161:
3158:
3156:
3153:
3151:
3148:
3146:
3143:
3141:
3138:
3136:
3135:Sperry (1950)
3133:
3131:
3128:
3126:
3123:
3121:
3118:
3116:
3113:
3111:
3108:
3106:
3105:Rhodes (1947)
3103:
3101:
3098:
3096:
3093:
3091:
3088:
3086:
3083:
3081:
3078:
3076:
3073:
3072:
3070:
3066:
3060:
3059:Aurora (1897)
3057:
3055:
3052:
3050:
3047:
3045:
3042:
3040:
3037:
3035:
3032:
3029:
3026:
3024:
3021:
3020:
3018:
3014:
3008:
3005:
3003:
3000:
2999:
2997:
2993:
2990:
2988:
2984:
2978:
2975:
2974:
2971:
2967:
2960:
2955:
2953:
2948:
2946:
2941:
2940:
2937:
2931:(Steven Levy)
2930:
2927:
2924:
2923:Jenny Randles
2920:
2917:
2914:
2911:
2909:
2906:
2904:
2901:
2898:
2894:
2891:
2890:
2886:
2881:
2880:0-8014-0740-0
2877:
2873:
2869:
2866:
2863:
2862:0-471-40976-6
2859:
2855:
2854:
2849:
2846:
2844:
2843:0-385-14348-6
2840:
2836:
2832:
2829:
2828:
2812:
2810:9781478610953
2806:
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2801:
2793:
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2732:
2728:
2724:
2717:
2714:
2702:
2696:
2693:
2688:
2684:
2679:
2674:
2671:(2): 109–20.
2670:
2666:
2662:
2655:
2652:
2648:
2644:
2641:
2636:
2633:
2628:
2624:
2620:
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2600:
2596:
2589:
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2574:
2562:
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2533:
2530:
2527:
2523:
2520:
2514:
2511:
2506:
2502:
2496:
2493:
2482:
2479:Ian Ridpath.
2475:
2472:
2468:
2464:
2461:
2458:
2453:
2450:
2446:
2441:
2438:
2433:
2429:
2425:
2423:0-385-14348-6
2419:
2415:
2408:
2405:
2392:
2385:
2379:
2376:
2364:on 2018-12-23
2363:
2359:
2355:
2354:
2349:
2345:
2339:
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2332:
2328:
2326:0-534-39550-3
2322:
2318:
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2263:
2261:
2258:
2256:
2253:
2251:
2248:
2246:
2243:
2241:
2238:
2237:
2232:
2230:
2228:
2227:mass hysteria
2224:
2219:
2216:
2210:
2203:Psychological
2202:
2200:
2197:
2194:According to
2192:
2190:
2186:
2182:
2178:
2175:According to
2170:
2168:
2166:
2162:
2158:
2154:
2150:
2142:
2140:
2138:
2134:
2130:
2126:
2122:
2118:
2114:
2106:
2104:
2102:
2101:Min Min light
2096:
2088:
2085:
2080:
2078:
2074:
2070:
2062:
2057:
2052:
2044:
2042:
2038:
2034:
2030:
2028:
2024:
2017:Misperception
2016:
2014:
2008:
2004:
1997:
1995:
1992:
1988:
1986:
1980:
1978:
1974:
1966:
1964:
1961:
1953:
1951:
1949:
1944:
1940:
1932:
1930:
1926:
1921:
1919:
1914:
1912:
1908:
1904:
1903:Gordon Cooper
1900:
1894:
1892:
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1884:
1880:
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1234:
1231:
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1225:
1222:
1219:
1216:
1215:
1207:
1204:
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1198:
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1189:
1188:
1187:
1185:
1177:
1175:
1171:
1167:
1164:
1156:
1154:
1150:
1143:
1141:
1139:
1138:worst reports
1135:
1130:
1121:
1118:
1115:
1112:
1109:
1106:
1103:
1100:
1097:
1095:Worst reports
1094:
1093:
1089:
1086:
1083:
1080:
1077:
1074:
1071:
1068:
1065:
1062:
1061:
1057:
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1033:
1031:
1030:
1017:
1011:
1009:
1007:
1002:
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996:
986:
983:
980:
977:
974:
971:
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966:
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950:
946:
943:
940:
937:
934:
931:
930:
926:
923:
920:
917:
914:
912:Psychological
911:
910:
906:
903:
900:
897:
894:
891:
890:
886:
883:
880:
877:
874:
871:
870:
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857:
854:
851:
850:
846:
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837:
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826:
823:
820:
817:
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811:
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797:
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791:
790:
786:
783:
780:
777:
774:
771:
770:
764:
762:
760:
756:
751:
748:
743:
735:
730:
727:
725:
722:
720:
717:
715:
712:
711:
710:
708:
700:
697:
695:
694:Magnus effect
692:
690:
687:
685:
682:
679:
675:
673:
670:
669:
668:
666:
661:
657:
649:
644:
640:
636:
632:
628:
624:
620:
616:
612:
609:
608:
603:
600:
599:
594:
591:
587:
586:
581:
577:
573:
572:(GEPAN/SEPRA)
569:
565:
561:
557:
553:
552:
548:
546:
545:
541:
540:
539:
533:
531:
529:
525:
520:
518:
514:
510:
505:
501:
489:
484:
482:
477:
475:
470:
469:
467:
466:
461:
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456:
453:
451:
448:
446:
443:
441:
438:
436:
433:
431:
428:
427:
426:
425:
420:
415:
412:
410:
407:
405:
402:
400:
397:
395:
394:Heaven's Gate
392:
390:
387:
385:
382:
381:
380:
379:
376:
372:
367:
364:
362:
359:
357:
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341:
338:
334:
329:
326:
324:
321:
319:
316:
314:
311:
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301:
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291:
289:
286:
284:
281:
279:
276:
274:
271:
270:
269:
268:
262:
259:
258:
255:
250:
247:
245:
242:
240:
237:
235:
232:
230:
227:
225:
224:Travis Walton
222:
220:
217:
215:
212:
210:
207:
205:
202:
200:
197:
195:
192:
190:
187:
185:
182:
180:
179:Mantell crash
177:
175:
172:
170:
167:
165:
162:
161:
160:
159:
156:
152:
148:
144:
143:
140:
136:
132:
123:
120:
112:
101:
98:
94:
91:
87:
84:
80:
77:
73:
70: –
69:
65:
64:Find sources:
58:
54:
48:
47:
42:This article
40:
36:
31:
30:
27:
19:
3979:Crop circles
3938:Perspectives
3888:Men in black
3833:Psychosocial
3786:
3719:
3476:South Africa
3381:
3352:
3344:21st century
3068:20th century
2871:
2851:
2848:Philip Plait
2834:
2831:Allan Hendry
2816:26 September
2814:. Retrieved
2799:
2792:
2783:
2774:
2762:. Retrieved
2756:
2746:
2734:. Retrieved
2726:
2716:
2705:. Retrieved
2695:
2668:
2664:
2654:
2635:
2602:
2598:
2588:
2576:
2564:. Retrieved
2560:
2550:
2545:(Plait, 205)
2541:
2532:
2513:
2504:
2495:
2484:. Retrieved
2474:
2463:
2452:
2445:Project SIGN
2440:
2413:
2407:
2395:. Retrieved
2378:
2366:. Retrieved
2362:the original
2357:
2351:
2344:Nickell, Joe
2338:
2330:
2316:
2310:
2223:Neil Smelser
2220:
2212:
2193:
2180:
2174:
2146:
2129:searchlights
2110:
2098:
2090:
2081:
2072:
2066:
2061:Fata Morgana
2045:Fata Morgana
2039:
2035:
2031:
2020:
2012:
1993:
1989:
1981:
1970:
1957:
1936:
1928:
1923:
1915:
1895:
1875:
1808:
1782:
1714:
1646:
1612:
1587:searchlights
1574:
1550:clouds, dust
1549:
1524:
1499:
1384:
1245:Astronomical
1244:
1181:
1172:
1168:
1163:Allan Hendry
1160:
1151:
1147:
1137:
1134:best reports
1133:
1131:
1127:
1063:Best reports
1005:
1003:
998:
995:astronomical
994:
992:
792:Astronomical
759:unidentified
758:
754:
752:
745:
704:
689:Vertical Jet
662:
659:
656:Project Sign
650:Project Sign
642:
631:Allan Hendry
610:
605:
596:
583:
571:
562:did for the
555:
549:
544:Project Sign
542:
537:
527:
523:
521:
498:Identifying
497:
449:
361:Men in black
234:Belgian wave
199:Mariana film
115:
106:
96:
89:
82:
75:
63:
51:Please help
46:verification
43:
26:
3902:Involvement
3722:(1947–1950)
3678:Grey aliens
3633:Foo fighter
3567:New Zealand
2897:Ian Ridpath
2566:20 February
2447:</rorce)
2368:23 December
1232:Total Cases
757:, 22% were
729:Aerodynamic
534:UFO studies
409:Scientology
356:Majestic 12
4108:Categories
4042:Skepticism
4001:Ufologists
3883:Dulce Base
3806:Hypotheses
3683:Insectoids
3090:1947 craze
2868:Carl Sagan
2707:2009-02-26
2486:2007-10-02
2302:References
1948:Phil Plait
755:identified
699:Aerostatic
455:Ufologists
109:April 2020
79:newspapers
4026:Religions
3974:Contactee
3943:Insurance
3933:Narrative
3928:Claimants
3878:Bob Lazar
3838:Nazi UFOs
3542:Indonesia
3492:Australia
3487:Argentina
2764:30 August
2736:30 August
2727:nymag.com
2165:blue jets
778:Excellent
623:U.S. Navy
375:Religions
351:Bob Lazar
204:1952 flap
169:1947 wave
4093:Category
3959:Implants
3923:Entities
2687:12643807
2643:Archived
2627:39932855
2522:Archived
2397:June 25,
2233:See also
2218:heads".
2155:such as
2117:moondogs
1583:moon dog
1500:balloons
1385:Aircraft
1235:Percent
1217:Category
999:aircraft
812:Aircraft
784:Doubtful
678:Wingless
504:sighting
4114:Ufology
4021:Fiction
4014:Culture
3918:History
3866:Area 51
3707:Studies
3502:Belgium
3497:Belarus
3482:Albania
2995:General
2977:Ufology
2619:5654860
2432:4642190
2157:sprites
2125:auroras
2121:sundogs
2113:mirages
2077:horizon
1960:bolides
1954:Meteors
1887:meteors
1883:planets
1850:Percent
1756:Percent
1688:Percent
1589:, etc.)
832:Balloon
404:Raëlism
346:Area 51
174:Roswell
139:ufology
93:scholar
3989:GEIPAN
3597:Sweden
3582:Russia
3577:Poland
3572:Norway
3557:Mexico
3532:Greece
3527:France
3512:Canada
3507:Brazil
3472:Africa
3353:Nimitz
3030:(740s)
2878:
2860:
2841:
2807:
2758:Forbes
2685:
2625:
2617:
2430:
2420:
2323:
2196:Forbes
2069:mirage
1891:blimps
1683:88.6%
1579:mirage
724:Ramjet
719:Rocket
707:thrust
95:
88:
81:
74:
66:
3952:Other
3587:Spain
3562:Nepal
3552:Italy
3537:India
3517:China
2623:S2CID
2561:Slate
2387:(PDF)
2161:elves
2084:radar
2073:below
1943:Venus
1933:Venus
1879:stars
1865:100%
1853:84.4%
1845:100%
1827:Cases
1799:2.8%
1751:8.6%
1733:Cases
1703:88.6%
1691:78.3%
1665:Cases
1637:1.2%
1617:kites
1613:other
1607:1.1%
1569:0.9%
1544:0.5%
1525:birds
1472:TOTAL
1467:0.7%
1184:CUFOS
932:Other
927:3.3%
887:0.7%
872:Birds
867:1.1%
787:Poor
684:Rotor
672:Wings
598:NICAP
366:Serpo
100:JSTOR
86:books
4031:list
3547:Iran
3380:USS
3351:USS
2966:UFOs
2876:ISBN
2858:ISBN
2839:ISBN
2818:2021
2805:ISBN
2766:2021
2738:2021
2683:PMID
2615:PMID
2568:2020
2428:OCLC
2418:ISBN
2399:2021
2370:2018
2321:ISBN
2163:and
1897:the
1881:and
1862:0.4%
1859:5.7%
1856:6.8%
1842:1307
1830:1103
1783:MISC
1771:8.6%
1765:1.2%
1762:1.4%
1697:4.4%
1694:5.4%
1680:1158
1668:1024
1490:37%
1444:17%
1421:19%
1375:42%
1334:moon
1281:29%
1122:14%
1058:All
1024:UFO
1021:IFO
997:and
987:17%
967:21%
924:3.3%
921:0.5%
915:2.0%
904:0.4%
901:1.0%
895:0.4%
884:1.2%
881:1.0%
878:0.9%
875:1.0%
864:2.9%
861:2.4%
855:2.2%
847:13%
827:16%
807:23%
781:Good
665:lift
604:The
576:CNES
564:USAF
556:BBSR
528:IFOs
137:and
135:UFOs
72:news
2673:doi
2607:doi
1941:,
1748:113
1700:.4%
1519:5%
1487:486
1475:435
1441:224
1429:196
1418:252
1406:230
1372:550
1360:519
1352:2%
1329:2%
1304:9%
1301:122
1289:113
1278:380
1266:360
1119:17%
1113:16%
1110:14%
1107:24%
1104:70%
1101:70%
1098:70%
1090:3%
1081:28%
1078:24%
1075:32%
1072:68%
1069:72%
1066:65%
1055:Civ
1052:Mil
1049:All
1046:Civ
1043:Mil
1040:All
1037:Civ
1034:Mil
984:13%
981:25%
978:33%
975:22%
964:14%
947:6%
907:0%
858:.9%
844:17%
841:17%
838:12%
835:15%
824:25%
821:22%
818:19%
815:22%
804:19%
801:23%
798:24%
795:22%
775:All
567:9%.
530:).
511:'s
55:by
4110::
2850:,
2833:,
2782:.
2755:.
2725:.
2681:.
2669:86
2667:.
2663:.
2621:.
2613:.
2603:26
2601:.
2597:.
2559:.
2503:.
2426:.
2389:.
2358:42
2356:.
2350:.
2329:.
2159:,
2135:,
2123:,
2119:,
2115:,
2103:.
2059:A
1979:.
1836:74
1833:89
1796:36
1768:0%
1759:6%
1742:16
1739:18
1736:79
1674:58
1671:71
1634:16
1622:12
1604:14
1581:,
1566:12
1554:10
1516:63
1507:35
1504:23
1481:29
1478:22
1464:10
1432:22
1412:22
1366:22
1349:22
1337:22
1326:24
1314:24
1272:16
1229:RV
1226:CE
1223:DD
1220:NL
1116:7%
1087:4%
1084:2%
961:4%
958:4%
955:9%
944:5%
941:5%
938:5%
935:5%
918:0%
898:0%
709:)
667:)
3593:)
3589:(
3478:)
3474:(
2958:e
2951:t
2944:v
2925:)
2921:(
2899:)
2895:(
2820:.
2786:.
2768:.
2740:.
2710:.
2689:.
2675::
2629:.
2609::
2570:.
2507:.
2489:.
2434:.
2401:.
2372:.
1839:5
1745:0
1677:5
1631:0
1628:1
1625:3
1615:(
1601:0
1598:4
1595:1
1592:9
1577:(
1563:0
1560:0
1557:2
1541:6
1538:0
1535:0
1532:1
1529:5
1513:3
1510:2
1484:0
1461:0
1458:1
1455:0
1452:9
1438:0
1435:6
1415:0
1409:0
1369:2
1363:7
1346:0
1343:0
1340:0
1323:0
1320:0
1317:0
1298:0
1295:4
1292:5
1275:2
1269:2
680:)
611:,
526:(
487:e
480:t
473:v
122:)
116:(
111:)
107:(
97:·
90:·
83:·
76:·
49:.
20:)
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