Timeline
The modern era of sightings, contact claims and official investigations, in order. Each entry says what was reported and what the record concluded, and links to the full case file or species dossier where the Atlas has one.
1940s
- 24 June 1947
Kenneth Arnold and the first 'flying saucers'
Private pilot Kenneth Arnold reported nine fast, crescent-shaped objects near Mount Rainier, Washington. A reporter's paraphrase of his description of their motion, 'like a saucer skipped across water', gave the world the phrase flying saucer and started the modern era of sightings.
- July 1947
Roswell
A rancher found strange debris on a sheep ranch in New Mexico. The army announced a recovered 'flying disc', then retracted it as a weather balloon within a day. The story lay dormant for three decades before becoming the most famous crash claim in the field.
Read the Roswell case file → - January 1948
Project Sign and the Mantell crash
The US Air Force opened Project Sign, its first formal UFO study. Days later Captain Thomas Mantell died chasing an object over Kentucky that was most likely a high-altitude Skyhook balloon. Sign was replaced by Project Grudge in 1949.
1950s
- July 1952
The Washington, D.C. flap
Over two weekends, radar operators at National Airport and Andrews Air Force Base tracked unidentified targets over the capital, and jets were scrambled. The Air Force attributed the returns to temperature inversions. The incident led directly to the CIA-sponsored Robertson Panel.
- 12 September 1952
The Flatwoods Monster
A group in Braxton County, West Virginia, saw a bright object cross the sky and, on a hilltop, a towering hooded figure with a glowing face. A meteor, a barn owl and fear are the accepted explanation; the creature became the town's emblem.
Read the Flatwoods case file → - 20 November 1952
Adamski at Desert Center
George Adamski said he met a long-haired man from Venus in the California desert. His 1953 book Flying Saucers Have Landed launched the contactee movement and the image of the benevolent, human-looking 'Nordic' visitor.
Read the Adamski case file → - January 1953
The Robertson Panel
A CIA-convened panel of scientists reviewed the evidence over four days and concluded that UFOs posed no direct threat but that public interest did. It recommended a programme to debunk reports and reduce their appeal, a decision later criticised as the root of official secrecy.
- 21 August 1955
The Kelly-Hopkinsville goblins
Two families at a Kentucky farmhouse said they spent a night shooting at small, silver, big-eared creatures that would not fall. Investigators found the witnesses sincere; sceptics suggest great horned owls. It is the source of the phrase 'little green men'.
Read the Kelly-Hopkinsville case file → - 16 October 1957
Antonio Villas Boas
A Brazilian farmer said he was taken from his tractor into an egg-shaped craft and made to breed with a small, fair-skinned woman. Reported to a doctor and a journalist within months, it predates the Hill case and is the first widely known abduction claim.
Read the Villas Boas case file → - November 1957
The Levelland sightings
Around Levelland, Texas, more than a dozen motorists reported a glowing object that stalled their engines and dimmed their headlights. Project Blue Book blamed ball lightning during a storm; the case remains a favourite of researchers because of its many independent witnesses.
1960s
- 19–20 September 1961
Betty and Barney Hill
A New Hampshire couple lost two hours on a mountain road and, under hypnosis in 1964, described being examined aboard a craft by small grey beings. The case set the template for every abduction account that followed.
Read the Hill case file → - 24 April 1964
Socorro: the Lonnie Zamora landing
Police officer Lonnie Zamora reported an egg-shaped craft on legs and two small figures in white outside Socorro, New Mexico. Burn marks and landing impressions were found. Blue Book's chief investigator called it the best-documented case in the files; it remains unexplained in the record.
- November 1966
Point Pleasant and the Mothman
Two couples in West Virginia reported a large winged figure with glowing red eyes near an abandoned munitions site. Sightings continued for a year and folklore later tied them to the Silver Bridge collapse. A sandhill crane is the usual explanation.
Read the Mothman case file → - 1966–1968
The Condon Committee
The Air Force funded a University of Colorado study led by physicist Edward Condon. Its 1968 report concluded that further study was unlikely to advance science. Critics noted that a share of its own cases stayed unexplained. It gave the Air Force grounds to close Blue Book.
- 17 December 1969
Project Blue Book closes
After 12,618 reports, of which 701 remained 'unidentified', the Air Force ended its public UFO investigation, stating that no case had threatened national security or shown evidence of extraterrestrial vehicles. The files were later declassified and are searchable today.
1970s
- 11 October 1973
The Pascagoula abduction
Two shipyard workers fishing on the Pascagoula River said they were floated into a craft by three wrinkled, clawed, robot-like beings. A secretly recorded conversation between the men convinced the sheriff they were frightened rather than lying.
Read the Pascagoula case file → - 5 November 1975
Travis Walton
A logger in Arizona vanished for five days after approaching a glowing disc in front of his crew. He returned describing small bald beings and tall human-like ones. The crew passed polygraphs; the case became the film Fire in the Sky.
Read the Walton case file → - August 1976
The Allagash abductions
Four art students on a canoe trip in Maine watched a glowing sphere send a beam toward their canoe and later, under hypnosis, described a shared examination aboard it. One of the four later withdrew his support for the story.
Read the Allagash case file → - 19 September 1976
The Tehran jet chase
Two Iranian F-4 Phantoms were sent after a bright object over Tehran; both reported instrument failures as they closed. A US Defense Intelligence Agency evaluation called it 'a classic which meets all the criteria necessary for a valid study'. Sceptics point to Jupiter and equipment faults.
- 6 December 1978
Zanfretta
A night watchman in Liguria, Italy, reported a huge green being with pointed ears and later, under hypnosis, described repeated abductions by a race he called the Dargos. Italian police recorded the initial event; the later chapters rest on hypnosis alone.
Read the Zanfretta case file →
1980s
- 26–28 December 1980
Rendlesham Forest
US airmen at RAF Woodbridge in Suffolk reported a glowing craft in the forest on two nights, and the deputy base commander recorded his own investigation on tape. A lighthouse, a meteor and a returning satellite are the sceptical explanations; it is often called Britain's Roswell.
Read the Rendlesham case file → - 29 December 1980
The Cash-Landrum incident
Two women and a boy in Texas said a diamond-shaped object surrounded by helicopters hovered over the road and burned them. All three fell ill. Their lawsuit against the US government was dismissed for lack of evidence that any such aircraft existed.
- 1981
Missing Time and the abduction template
Artist Budd Hopkins's book Missing Time argued that abductions were common, hidden by amnesia and recoverable by hypnosis. His work, and later Intruders (1987), fixed the Grey as the standard abductor and made hypnotic regression the field's main tool.
Read the Grey dossier → - 1987
Communion
Novelist Whitley Strieber's account of visitors at his cabin in upstate New York topped the bestseller lists. Its cover painting, a slender being with vast almond eyes, became the definitive public image of the Grey.
Read the Communion case file → - November 1989 – 1990
The Belgian wave
Hundreds of people, including police officers, reported large silent triangles over Belgium. The Belgian Air Force tracked targets on radar and scrambled F-16s. A famous photograph of the triangle was admitted to be a hoax in 2011; the radar events remain debated.
- November 1989
Bob Lazar and Area 51
A man calling himself a physicist told a Las Vegas television station he had worked on alien craft at a site called S-4 near Area 51. His credentials could not be confirmed. The interview made Area 51 a permanent fixture of the mythology.
1990s
- 1991
The Reptilian narrative goes mainstream
Former broadcaster David Icke began publishing the claim that shape-shifting reptilian beings secretly control world affairs. The idea drew on older contactee and pulp material and has been widely criticised for its conspiratorial and antisemitic undertones.
Read the Reptilian dossier → - 16 September 1994
The Ariel School sighting
Sixty-two children at a school outside Harare, Zimbabwe, said a silver craft landed by the playground and a small being in black looked at them. Harvard psychiatrist John Mack interviewed them on film. It is the largest child-witness case on record.
Read the Ariel School case file → - 1994
John Mack's Abduction
Harvard psychiatry professor John Mack published Abduction: Human Encounters with Aliens, treating abductees as sane people describing something real to them. Harvard reviewed his work and affirmed his academic freedom. He died in 2004.
- January 1996
Varginha
Three young women in Varginha, Brazil, reported a crouching brown creature with red eyes and a strong smell. Rumours of military captures followed. A 2010 investigation named a local man with a disability as the likely 'creature'; the town embraced the story anyway.
Read the Varginha case file → - 13 March 1997
The Phoenix Lights
Thousands in Arizona watched a V-formation of lights cross the state and, later, a row of lights hang over Phoenix. The Air Force said the second event was flares dropped by A-10 aircraft. Governor Fife Symington mocked the sighting at the time and later said he had seen it himself.
2000s
- 14 November 2004
The Nimitz 'Tic Tac'
Pilots from the USS Nimitz carrier group off California reported a white, wingless object that moved in ways they could not explain, tracked by ship radar. The infrared video and pilot testimony became public in 2017 and anchored the modern UAP debate.
- 2007–2012
AATIP
The Pentagon quietly funded the Advanced Aerospace Threat Identification Program at the request of Senator Harry Reid. Its existence was confirmed in 2017 when its former director, Luis Elizondo, resigned and went public.
2010s
- 16 December 2017
The New York Times story
The Times revealed AATIP and published two Navy infrared videos. Coverage shifted from ridicule to national-security framing, and the term UAP, unidentified aerial phenomena, replaced UFO in official use.
2020s
- 27 April 2020
The Pentagon releases the videos
The Department of Defense formally released the FLIR1, Gimbal and GoFast videos, confirming they were real Navy footage and that the objects in them remained 'unidentified'. It said nothing about what they were.
- 25 June 2021
The ODNI preliminary UAP report
The Office of the Director of National Intelligence reported on 144 military UAP incidents since 2004 and could explain only one. It listed possible categories from airborne clutter to foreign systems and 'other', and called for better data collection.
- July 2022
AARO is created
The Pentagon set up the All-domain Anomaly Resolution Office to track and resolve UAP reports across air, sea and space. Its case count passed 800 by 2023, most explained as balloons, drones and clutter.
- 26 July 2023
The Grusch hearing
Former intelligence officer David Grusch told a House subcommittee under oath that the US held recovered 'non-human' craft and biological material, citing others' accounts. AARO and the Pentagon said they had found no evidence supporting the claim.
- 8 March 2024
AARO's historical report
AARO's review of US government UAP records since 1945 found no evidence that any investigation had confirmed extraterrestrial technology, and traced many rumours to misidentified secret aircraft and programmes. The debate did not end.
Dates and findings follow the public record: Project Blue Book files, the Condon report, the 2021 ODNI preliminary assessment and AARO's 2024 historical review, alongside the witnesses' own accounts. Witness claims are reported as claims. Inclusion does not constitute scientific verification.