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A typical comet contains some 1013 kg of water ice. How many comets would have to strike Earth in order to account for the roughly 2×1021 kg of water presently found on our planet?  If this amount of water accumulated over a period of 500 million years, how frequently must Earth have been hit by comets during that time?

- November 14, 2022 - Edwin Tunner

A typical comet contains some 1013 kg of water ice. How many comets would have to strike Earth in order to account for the roughly 2×1021 kg of water presently found on our planet?  If this amount of water accumulated over a period of 500 million years, how frequently must Earth have been hit by comets during that time? 

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