📖 Encyclopedia Science · · 1 min read
Five observables
Luis Elizondo's list of five unusual flight traits reported in UAP encounters.
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#term articles
Investigations, analysis and news from the community.
📖 Encyclopedia Science · · 2 min read
Alien implants
Objects that claimed abductees say aliens placed in their bodies.
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📖 Encyclopedia Science · · 3 min read
Demonic UFO hypothesis
The belief that UFOs and alien encounters are the work of demons.
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📖 Encyclopedia Science · · 3 min read
Cryptoterrestrial UFO hypothesis
The idea that UFOs come from a hidden civilisation native to Earth.
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📖 Encyclopedia Science · · 3 min read
Interdimensional UFO hypothesis
The idea that UFOs come from other dimensions or realities rather than other planets.
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📖 Encyclopedia Science · · 2 min read
Angel hair
A cobweb-like substance said to fall from the sky during UFO sightings.
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📖 Encyclopedia Science · · 2 min read
Contactee
A person who claims friendly contact with extraterrestrials, especially the 1950s claimants.
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📖 Encyclopedia Science · · 1 min read
Psychosocial hypothesis
The view that UFO reports are best explained by psychological and social factors.
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📖 Encyclopedia Science · · 1 min read
Die Glocke
A supposed secret Nazi anti-gravity device described from 2000.
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📖 Encyclopedia Science · · 1 min read
Reptilians
Shape-shifting reptile aliens of conspiracy theory, popularised by David Icke.
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📖 Encyclopedia Science · · 1 min read
Nordic aliens
Tall, fair-haired aliens described by 1950s contactees.
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📖 Encyclopedia Science · · 1 min read
Ancient astronauts
The belief that aliens visited Earth in ancient times.
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📖 Encyclopedia Science · · 1 min read
Drake equation
Frank Drake's 1961 formula for estimating the number of detectable civilisations.
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📖 Encyclopedia Science · · 2 min read
Fermi paradox
The puzzle of why no evidence of alien civilisations has been found.
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📖 Encyclopedia Science · · 1 min read
Crop circles
Patterns flattened into crops, linked to UFOs in the 1980s and largely shown to be human-made.
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📖 Encyclopedia Science · · 2 min read
Black Knight satellite
A modern legend of an ancient alien satellite orbiting the Earth.
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📖 Encyclopedia Science · · 1 min read
Yankee Blue
An alleged Air Force induction briefing in which officers were shown a fake picture of an antigravity craft, reported by The Wall Street Journal in 2025.
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📖 Encyclopedia Science · · 2 min read
Weather balloon
A balloon carrying weather instruments, used to explain the Roswell debris.
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