Quote:
Originally Posted by rogueteens
Eh? Firstly, there have been quite a few Goldilocks planets found already and secondly, if there are spacefaring aliens out there, why would they visit us anyway and if they did want to visit, how do you know they haven't (ancient alien theory)?
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the thinking goes thusly:
If the universe is full of life-friendly planets, and if life often evolves to intelligence and space travel as it has done here, the mystery is why aren?t we already overrun with waves of aliens? Since ages and ages ago?
One theory was that we?re among the first; others haven?t had time yet to evolve and spread very far. But now that explanation is shot to pieces.