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Search options not deleted user 70670

For questions about planet Earth as we know it. Changed Earths (extra moon, closer solar orbit, etc) should use the [earth-like] tag.

11 votes

Why would Earth be long-term unsuitable for an advanced alien species that's already coloniz...

They actually cannot live on Earth for extended periods of time Your premise is that Earth should be a candidate, since: "[...] some have been on Earth for 20 years. [...] … No sir, I'll take 20 years on Earth any day. …
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