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Comets, many scientists believe.

A few, such as British astronomer Sir Fred Hoyle, believed that perhaps organic molecules may have even brought life itself to the Earth in the early days of our planet. This hypothesis, called "panspermia", suggests that the universe might be filled with life spread from only one or a few original locations. So far, this is only an idea; there is no evidence at all to support it. However, since we have conducted only the most cursory examination of a couple of planets and moons in this one solar system, it cannot be completely discounted.

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Loma Schowalter

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3y ago

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