MEXICO: Scientists have long wondered how Earth came to be covered by 70 percent water – and a new study suggests that the answer may lie in asteroids and comets.
A study published in the journal Monthly Notices of the Royal Astronomical Society, describes water delivery via asteroids or comets is likely taking place in many other planetary systems, just as it happened on Earth, writes Nature World News.
According to conventional theory, water came to Earth when it was a dry, inhospitable world transported by icy comets and asteroids colliding with Earth – depositing water on the surface. Though, some scientists have said that in addition to these “wet” comets, Earth created the watery conditions from a series of geologic processes. Another theory concludes that such collisions would have made any existing water evaporate, and that surface water originated from carbonaceous chondrites, the most primitive kinds of meteorites.
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