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the universe is 14 billion years old.
the earth is 4.5 billion years old
it took 3.5 billion years for intelligent life to develop here on earth, and that's with the development starting relatively early in the lifespan of the earth.
based on these #s, i wonder if it's possible another lifeform evolved fast enough to have developed the technology to have visited here, even any time in the recent past, let alone millions of years ago.
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