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Re:A newly discovered moon tunnel by JumpCrisscross on Sunday October 22, 2017 @05:04PM (#15528922)
> Why couldn't the Earth have formed with its own water?

We’re not sure from where Earth’s water came [1]. Some evidence suggests the Earth was born with all its water, some that most came from comets.

[1] https://en.m.wikipedia.org/wiki/Origin_of_water_on_Earth

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