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Q&A Would this type of atmosphere be suitable for human life?

I've been trying to create a Earth-like planet but I'm not sure if my planet's atmosphere is breathable. (It's mostly the amount of helium I'm worried about). I've tried to make it Earth-like whil...

4 answers  ·  posted 6y ago by A good username‭  ·  last activity 5y ago by A good username‭

Question earth-like atmosphere planets earth