Earth was born dry until a cosmic collision made it a blue planet

Re:Earth was born dry until a cosmic collision made it a blu... by tastyfreeze on Saturday October 04, 2025 @04:17PM (#45476341)

Earth has been struck by large comets many times killing the majority of life on the planet each time. In an early solar system it would be more frequent. Once a comet impacts there is one less comet out there. The solar system cleans up over time making impacts less likely over time.

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Re:Earth was born dry until a cosmic collision made it a blu... by kulahan on Saturday October 04, 2025 @04:54PM (#45476614)

There isn’t that much of a difference in the number of comets in space across just 5 billion years.

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Re:Earth was born dry until a cosmic collision made it a blu... by mkl on Saturday October 04, 2025 @08:06PM (#45477854)

There's not much difference between now and 3.5-3.8 billion years ago, but before that there were a lot more: https://en.wikipedia.org/wiki/Late_Heavy_Bombardment

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