No one has found one, but that doesn’t mean one couldn’t exist. The probability is that others do exist but outside our solar system so far away that we can’t see them.
No there isn’t…well not that we know of anyway but scientists are still exploring the universe so who knows what they may find in thousands/millions of years time outside our solar system!
I don’t think humans can live on another planet because they are either too cold or too hot for us however there could be animals or mammals that have adapted to different living conditions and do live on other planets
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