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  2. Silurian hypothesis - Wikipedia

    en.wikipedia.org/wiki/Silurian_hypothesis

    The hypothesis also speculates that artifacts from past civilizations could be found on the Moon and Mars, where erosion and tectonic activity are less likely to erase evidence. The concept of pre-human civilizations has been explored in popular culture, including novels, television shows, short stories, and video games.

  3. Ancient astronauts - Wikipedia

    en.wikipedia.org/wiki/Ancient_astronauts

    Proponents cite ancient mythologies to support their viewpoints based on the idea that ancient creation myths of gods who descend from the heavens to Earth to create or instruct humanity are representations of alien visitors, whose superior technology accounts for their perception as gods.

  4. Xenoarchaeology - Wikipedia

    en.wikipedia.org/wiki/Xenoarchaeology

    Xenoarchaeology, a branch of xenology dealing with extraterrestrial cultures, is a hypothetical form of archaeology that exists mainly in works of science fiction. The field is concerned with the study of the material remains to reconstruct and interpret past life-ways of alien civilizations.

  5. Cryptoterrestrial hypothesis - Wikipedia

    en.wikipedia.org/wiki/Cryptoterrestrial_hypothesis

    The cryptoterrestrial hypothesis proposes that reports of flying saucers or UFOs are evidence of a hidden, Earth-based, technologically-advanced civilization. [1] [2]Aaron John Gulyas, a scholar of conspiracy theories, characterized the so-called hypothesis as "really more of a thought experiment designed to raise questions", while others note that "even people open to the cryptoterrestrial ...

  6. History of the extraterrestrial life debate - Wikipedia

    en.wikipedia.org/wiki/History_of_the...

    They pointed out that if Earth moves a stellar parallax would change the location of stars in the sky during the year. Although stellar parallax does exist, stars are too far away from Earth, more than Greeks considered, to be noticeable by the naked eye. [3] Plato (left) and Aristotle (right) opposed the idea of a plurality of worlds.

  7. Mysterious alien-like statues unearthed from ancient Stone ...

    www.aol.com/news/mysterious-alien-statues...

    Archaeologists have unearthed strange alien-looking statues with elongated heads from over 7,000 years ago in Kuwait, shedding more light on the origin and evolution of one of the oldest ...

  8. Extraterrestrial life - Wikipedia

    en.wikipedia.org/wiki/Extraterrestrial_life

    The atmosphere of Earth is rich in nitrogen dioxide as a result of air pollution, which can be detectable. The natural abundance of carbon, which is also relatively reactive, makes it likely to be a basic component of the development of a potential extraterrestrial technological civilization, as it is on Earth.

  9. Alien Civilizations May Be Able to Send Us Messages by the ...

    www.aol.com/lifestyle/alien-civilizations-may...

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