Why haven't we discovered alien civilizations? Explore the Fermi Paradox and scientists' most chilling theories, from the Great Filter and hostile extraterrestrials to hidden civilizations and humanity's possible fate.
In 1983, scientists found a rock containing fossilized microbes that had come to Earth from Mars.
David Bowie—an artist who knew a thing or two about space aliens—famously asked: “Is there life on Mars?” Scientists have long wondered the same thing. And if not on Mars, then where? With increasingly sophisticated...
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