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  2. Extraterrestrial life - Wikipedia

    en.wikipedia.org/wiki/Extraterrestrial_life

    Ufology claims that many unidentified flying objects (UFOs) would be spaceships from alien species, and ancient astronauts hypothesis claim that aliens would have visited Earth in antiquity and prehistoric times but people would have failed to understand it by then. [148]

  3. Extraterrestrial UFO hypothesis - Wikipedia

    en.wikipedia.org/wiki/Extraterrestrial_UFO...

    Aliens are the subject of numerous urban legends, including claims that they have long been present on earth or that they may be able to assist humans in resolving certain issues. Despite these myths, the truth is that there is no scientific proof to back up these assertions, hence we cannot declare with certainty whether or not aliens exist. [55]

  4. Time-traveler UFO hypothesis - Wikipedia

    en.wikipedia.org/wiki/Time-traveler_UFO_hypothesis

    Later, the dwarf-like alien scientist Dr. Z'ong reveals to Mortimer that commander Basam Damdu, absolute dictator of the Yellow Empire from The Secret of the Swordfish, along with his army, including Zong himself, are humans from 8061, a time when the earth is deserted due to a long nuclear war in the 21st century and humans are an endangered ...

  5. Interdimensional UFO hypothesis - Wikipedia

    en.wikipedia.org/wiki/Interdimensional_UFO...

    The interdimensional hypothesis is a proposal that unidentified flying object (UFO) sightings are the result of experiencing other "dimensions" that coexist separately alongside our own [1] in contrast with either the extraterrestrial hypothesis that suggests UFO sightings are caused by visitations from outside the Earth or the psychosocial hypothesis that argues UFO sightings are best ...

  6. Planetary habitability in the Solar System - Wikipedia

    en.wikipedia.org/wiki/Planetary_habitability_in...

    Planetary habitability in the Solar System is the study that searches the possible existence of past or present extraterrestrial life in those celestial bodies. As exoplanets are too far away and can only be studied by indirect means, the celestial bodies in the Solar System allow for a much more detailed study: direct telescope observation, space probes, rovers and even human spaceflight.

  7. Timeline of science fiction - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_science_fiction

    This is a timeline of science fiction as a literary tradition. While the date of the start of science fiction is debated, this list includes a range of ancient, medieval, and Renaissance-era precursors and proto-science fiction as well, as long as these examples include typical science fiction themes and topoi such as travel to outer space and encounter with alien life-forms.

  8. What happens when we find aliens? The Pentagon has a plan ...

    www.aol.com/news/happens-aliens-pentagon-plan...

    Welcome to This Week in Outer Space, where you’ll find a roundup of the best space coverage from Yahoo News and our partners from the past week or so. Skip to main content. 24/7 Help. For ...

  9. Timeline of the far future - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_the_far_future

    Assuming that protons do not decay, estimated time for rigid objects, from free-floating rocks in space to planets, to rearrange their atoms and molecules via quantum tunneling. On this timescale, any discrete body of matter "behaves like a liquid" and becomes a smooth sphere due to diffusion and gravity. [142] 1.16×10 67 (11.6 unvigintillion)