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This brings up the idea that life may have been seeded into the solar system by comets or asteroids carrying dormant bacteria, instead of spontaneously appearing from ancient pools of slime. This does seem more likely and would also mean that other parts of the galaxy may have been seeded in the same way. However each planet where life might have been seeded would evolve its own particular traits best suited for that environment.
I doubt it would be anything even close to star trek, where most species have human form with a funny looking head. We may not even know what to look for, since other life forms may not even be carbon based. I'm sure that the truth is much stranger than any fiction.
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