Dear @jadams2k18, i believe there could be another earth over the universe, but when we are talking about 5 million light years distance what we are talking about? We cannot go to mars and you think they can come here from so big distance? Near by us there is nothing, near i mean less than 100 light years, it means one entire life at light speed (!!!) is not enough to go out from our galaxy...
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Hi @intellihandling!
You're right, the distance could be another problem. Maybe they came thousands of years ago, but given the distance from their natal planets, a return would take thousands of years more. Maybe that's why we don't see any evidence of them.
Very good theory
Thanks for commenting