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Q&A How can this habitable planet have a moon with a naturally occurring atmosphere?

Assuming the planet is earth-like, with more surface water and atmospheric oxygen, and within the habitable zone of a sun-like star, how can a moon orbiting this planet retain a thick atmosphere? ...

5 answers  ·  posted 6y ago by Tardigreat‭  ·  last activity 6y ago by Tardigreat‭

Question atmosphere planets moons stars habitability