Most scientists agree that at least a large portion of the Earth's water came from space, but it remains a bit of a mystery how it arrived on the surface. Being the only known planet in the Solar System to contain oceans of liquid water, the Earth is unique. Solving this puzzle involves intensive study of objects in space, some that have fallen to the ground and others that have been harvested directly from asteroids by spacecraft.
The early origins of planet Earth are thought to be violent and
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