|MadSci Network: Earth Sciences|
I've been reading about the panspermia hypothesis (life was brought to Earth by comets or asteroids) when it struck me - where does the water on Earth come from? Several authors say that Earth was too hot for water in the beginning, but they don't say where the water in the oceans came from. Was all the water on Earth brought here by comets? If so, does this strengthen the panspermia hypothesis? Side question: does a planet need an atmosphere to keep water; would water boil off a planet with no atmosphere? Thanks for your answer!
Re: Did comets bring all the water to Earth?
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