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Whether they would be able to or want to travel here in saucers I do not know.
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That's the problem I have with this speculation. We imagine aliens the same way we imagine gods, as similar to ourselves.
I agree that life on other planets is probable. But that form of life has little chance to resemble us unless every condition of their planet matched this one. Aliens could be mold, slime or look like wombats. They could be as able to navigate the stars as we are. Bilateral symmetry may not be universal. That could result is some very odd looking aliens.