Are we alone in the universe? Consider mysterious "extraterrestrial" radio signals. Unexplained gases on other planets.
Some sci-fi movies get better as time go by, developing cult followings that recognize how relevant they remain decades later ...
Isaac Arthur on MSN
The idea of alien gods sounded ridiculous - until technology became indistinguishable from divinity
Science fiction often imagines alien civilizations so advanced they seem like gods, with powers that look supernatural to anyone beneath them. But this episode asks a darker and more fascinating ...
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