itsfullofstars: Earth Oceans Were Homegrown Where did Earth’s oceans come from? Astronomers have long contended that icy comets and asteroids delivered the water for them during an epoch of heavy bombardment that ended about 3.9 billion years ago.

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itsfullofstars: Earth Oceans Were Homegrown Where did Earth’s oceans come from? Astronomers have long contended that icy comets and asteroids delivered the water for them during an epoch of heavy bombardment that ended about 3.9 billion years ago.

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