Why do astronomers think that there may be other advanced civilizations?

asked Aug 4, 2017 55.2k views

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2 votes

because space is so huge that it would be silly to think that were the only ones

Bgoldst answered Aug 5, 2017

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7 votes

So much of space is unexplored and there are possible signs of previous life on planets such as Mars

Serzas answered Aug 10, 2017

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