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We're not certain that it is important; in fact, we're not even certain that the Oort Cloud EXISTS.

Astronomer Jan Oort theorized that there must be a shell of debris, the remnants of the formation of the Sun and planets, still slowly orbiting very far from the Sun. Oort believed that this may be a reservoir of long-period comets, and that minor gravitational perturbations of the cloud might cause debris to occasionally drop in to the solar system as comets.

If this hypothesis is true (and there is precisely NO evidence either way) then the Oort Cloud might have contributed primordial water through cometary collisions early in the Earth's history.

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