In order for a planet to be habitable or hospitable for life, it needs to meet certain criteria. They have to be the right distance from a star, they have to be big enough to have a molten center, and the planet needs to have rock.
Exoplanets, which are planets outside of our solar system, may not only support life other than our own, but we could also consider these as oases in the universe in case we are ever forced to leave Earth. As of right now, obviously there is no way we can travel to these planets, but with changes in space travel and space colonies, we may get there one day.
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