Space & Extraterrestrial Theories

In 1976 NASA's Viking 1 orbiter photographed a mesa in the Cydonia region of Mars that, under low resolution and slanting sunlight, resembled a humanoid face. Fringe researchers argued it was an artificial monument built by a lost Martian civilization and that NASA covered up the truth, but higher-resolution imaging over the following decades resolved it into an ordinary eroded hill.

The Dulce Base legend claims a multi-level, jointly-operated human-alien facility hides beneath Archuleta Mesa near Dulce, New Mexico, complete with genetic experiments, a 'Nightmare Hall,' and a 1979 firefight between aliens and human security. No physical evidence for any such base has ever surfaced. The story's documented origin is far stranger than the myth: a real U.S. Air Force disinformation campaign, run through AFOSI, that targeted Albuquerque businessman Paul Bennewitz and helped manufacture a modern UFO legend.

Robert Temple's 1976 book The Sirius Mystery claimed the Dogon people of Mali held impossible ancient knowledge of Sirius B, an invisible white-dwarf companion star with a ~50-year orbit, taught to them by amphibious extraterrestrials called the Nommo. The claim rests on 1930s-40s ethnography by Marcel Griaule and Germaine Dieterlen. But a 1991 field restudy by anthropologist Walter van Beek found Dogon informants did not actually hold the Sirius-B lore Griaule reported, Sirius B's existence and orbital period were already well known to Western science before Griaule arrived, and Carl Sagan and others argue the knowledge, if genuine, reached the Dogon through ordinary human contact.

The Black Knight satellite is the belief that an artificial object of extraterrestrial origin, roughly 13,000 years old, has been silently orbiting Earth in a near-polar orbit. In reality it is a single 'legend' assembled from at least six unrelated, individually explained events, capped by 1998 NASA photos of a lost thermal blanket.

On the evening of 13 March 1997, two distinct aerial events over Arizona generated thousands of eyewitness reports and became one of the most widely documented mass-UFO-sighting events in American history. The first event — a V-formation of lights moving south from Henderson, Nevada through Phoenix to Tucson between roughly 8:15 and 8:30 p.m. — has been explained as five A-10 Thunderbolts flying in formation. The second event — stationary lights appearing over the Estrella Mountains south of Phoenix around 9:30 p.m. — was later identified by the US Air Force as LUU-2B/B illumination flares dropped by the Maryland Air National Guard's 175th Fighter Squadron during Operation Snowbird at Barry Goldwater Range. Governor Fife Symington III mocked the reports at a press conference but admitted in 2007 that he personally saw the formation.

Between November 1989 and April 1990, thousands of witnesses across Belgium — primarily in the Eupen and Wallonia regions — reported large, silent, triangular craft with bright lights at their corners. The Belgian Air Force took the reports seriously enough to scramble F-16 fighters on the night of 30–31 March 1990, and Col Wilfried De Brouwer publicly briefed the sightings in a rare military acknowledgement. The wave produced the famous Petit-Rechain photograph, long considered the best evidence of a structured craft — until 2011, when photographer Patrick Maréchal admitted it was a polystyrene model he had painted and photographed. The Society for the Study of Space Phenomena (SOBEPS) conducted two investigations but reached no definitive conclusion about the craft's origin.

Over two nights in late December 1980, USAF airmen stationed at RAF Woodbridge and RAF Bentwaters in Suffolk reported encountering a landed or hovering unidentified craft in Rendlesham Forest. Lt Col Charles Halt later filed an official memo describing the incident, which was declassified via FOIA in 1983. Investigators Ian Ridpath and Kevin McClure subsequently identified mundane explanations: the Orfordness Lighthouse and the reentry of Soviet satellite Cosmos 749. The UK Ministry of Defence concluded in 2001 the event had 'no defence significance.' The incident is sometimes called 'Britain's Roswell.'

On 5 November 1975, 22-year-old Travis Walton claimed he was struck by a beam of light from a UFO and taken aboard a craft while six logging crew members watched near Apache-Sitgreaves National Forest, Arizona. Walton was missing for five days. The crew initially became suspects in his disappearance. When Walton reappeared, he described an encounter with humanoid beings aboard the craft. Multiple polygraph tests were administered to crew members and Walton over subsequent years, with contested and contradictory results. The case was dramatised in the 1993 film Fire in the Sky. No physical evidence has been produced.

On the night of 11 October 1973, shipyard workers Charles Hickson (42) and Calvin Parker (19) claimed they were abducted from the banks of the Pascagoula River in Mississippi by three robotic beings who transported them aboard an oval craft for a medical examination. Sheriff James Caldwell, after interviewing the men, left them alone in a room with a hidden recorder — neither man broke their story when unobserved. Hickson subsequently passed a polygraph. No physical evidence of the encounter has been produced. The case remains one of the most-cited close-encounter reports but has no corroborating physical evidence.

On 30 June 1908, a massive explosion flattened approximately 2,150 square kilometres of Siberian taiga near the Podkamennaya Tunguska River. The blast, estimated at 10-15 megatons TNT equivalent, left no impact crater. Conspiracy framings — most notably that the explosion was caused by a weapon devised by Nikola Tesla — have circulated since the mid-twentieth century. Scientific investigations from 1961 through 2013, including the Anfinogenov sphere findings and Kvasnytsya nanodiamond paper, are consistent with an asteroid or comet air burst. The Tesla-weapon hypothesis has no evidentiary basis.

In November 2004, F/A-18 Super Hornet pilots from USS Nimitz Carrier Strike Group encountered an unidentified aerial object off the coast of Catalina Island, California. Commanders David Fravor and Alex Dietrich witnessed a white, Tic-Tac-shaped craft performing maneuvers inconsistent with known aviation technology. FLIR footage was captured and later released publicly in 2017. The Pentagon confirmed the existence of its Advanced Aerospace Threat Identification Program (AATIP) following a New York Times investigation in December 2017. The encounters are real and documented; whether the objects are of extraterrestrial origin remains unestablished.

A persistent Moon Landing Hoax sub-theory claims that director Stanley Kubrick filmed fake Apollo mission footage on a soundstage — often citing his 1968 film *2001: A Space Odyssey* as proof of his technical capability. Multiple independent lines of evidence refute the claim. The sustained low-gravity movement shown in Apollo footage (1/6 g for hours at a time) was technically impossible to simulate with 1960s film technology; *2001* itself used techniques that would have been immediately identifiable if applied to Apollo footage. The Soviet Union, tracking the missions and with every incentive to expose a fake, confirmed the missions. The Apollo program returned 842 lbs of lunar samples distributed to international labs. Lunar Reconnaissance Orbiter photographs from 2009 onward show Apollo landing sites with hardware and tracks still visible.

A common sub-theory of the Moon Landing Hoax claim holds that the Van Allen radiation belts surrounding Earth make a crewed lunar mission impossible — that astronauts would have received a lethal radiation dose before even reaching the Moon. The scientific record contradicts this. NASA engineered the Apollo trajectory to minimise belt exposure, reducing transit time to roughly one hour each way through the most intense zones. Total measured doses across the missions were well within established safe limits. The physicist who discovered the belts, James Van Allen, explicitly endorsed the Apollo missions and rejected the radiation-impossibility claim.

Claims that Artemis II mission photos, videos, or broadcasts prove the lunar flyby was staged or AI-generated.

Claims that governments run hidden breakaway space fleets or off-world bases.

Tracker for claims about official UAP historical reports and what they do or do not establish.

A media-provenance page tracing alien-autopsy film and image claims.

Claims that mummified remains promoted from Peru are non-human alien bodies.

Claims that a hidden planet is approaching Earth and repeatedly predicted to cause apocalypse.

Claims that NASA or governments will fake an alien or religious event using holograms to create world government.

The September 19-20, 1961 claim by Betty and Barney Hill (New Hampshire couple) of being abducted by extraterrestrials during a drive from Canada. The first widely-publicized modern alien abduction account; subsequent cultural template for many later reports.

The December 26-28, 1980 incidents near RAF Woodbridge (a US-operated base in Suffolk, England) when USAF personnel reported unusual lights and an "illuminated triangular craft" in the adjacent Rendlesham Forest.

On March 13, 1997, thousands of Arizonans witnessed lights moving in formation over Phoenix, Nevada, and northern Mexico. Claims include alien craft, experimental aircraft, and (the USAF's partial explanation) military flares dropped during training.

The claim, based on a 1984 packet of allegedly leaked documents, that President Truman in 1947 established a secret committee (Majestic 12 or MJ-12) of 12 scientists and military officers to study recovered UFO craft from Roswell.