Saturn's Gorgeous Rings May Be Dwarf Planet Carcasses

Astronomers think that thousands of Pluto-size bodies once dwelled in the Kuiper Belt — the ring of frigid objects beyond Neptune's orbit — shortly after the solar system formed. The resulting gravitational jostles sent many objects in these two realms careening toward the inner solar system, causing an era of increased cosmic impacts known as the Late Heavy Bombardment.

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