Comets a water source for thirsty early Earth (Reuters)

The comet Hartley is seen in this undated image courtesy of NASA. Astronomers have found the first comet with ocean-like water in a major boost to the theory that the celestial bodies were a significant source of water for a thirsty early Earth. REUTERS/NASA/HandoutReuters - Astronomers have found the first comet with ocean-like water in a major boost to the theory that the celestial bodies were a significant source of water for a thirsty early Earth.

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