Could aliens have visited Earth before humans developed civilization? Some scientific clues keep the question alive

Earth’s deep past leaves plenty of unanswered questions. None currently proves an alien visit, but scientists know the ...

Could alien organisms survive in temperatures that would kill humans instantly? Science is revealing how far life can adapt

Earth already contains organisms that survive conditions humans could never endure. Alien life, if it exists, may force ...
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What if aliens don’t need planets to survive? Scientists have considered some extraordinary possibilities

Alien life may not need the kind of home humans instinctively search for. Some of the strangest possibilities begin once ...
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‘Alien’ DNA found inside humans — it was inserted into our genes, bonkers new study claims

Is it the invasion of the genome snatchers? Just in case the idea of aliens walking around in human skin suits wasn’t frightening enough. An outlandish study asserts that aliens might have abducted us ...