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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.
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 ...
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.
The dark forest hypothesis is distinct from the Berserker hypothesis in that under the former, many alien civilizations could still exist provided they keep silent. The former can be viewed as a special case of the latter, if the deadly probes are (e.g. due to resource scarcity) only sent to star systems that show signs of intelligent life.
Although the extraterrestrial hypothesis (ETH) as a phrase is a comparatively new concept, one which owes much to the flying saucer sightings of the 1940s–1960s, its origins can be traced back to a number of earlier events, such as the now-discredited Martian canals and ancient Martian civilization promoted by astronomer Percival Lowell ...
It turns out the Milky Way may have once been full of bustling alien civilizations, but they are all dead now. The paper, which is a preprint and awaiting peer review, amounts to an update to the ...
The Kardashev scale is a speculative method of measuring a civilization's level of technological advancement, based on the amount of energy a civilization is able to utilize. [11] The Drake equation is a probabilistic framework used to estimate the number of active, communicative extraterrestrial civilizations in the Milky Way galaxy. [12]
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 ...