Asteroids may be the reason Earth is covered in water

The origin of water on Earth has long been a contested question — water forms in the course of many chemical reactions, and it is also a major component of comets. So, researchers frequently debate which of these is the ultimate source of most of the water on our planet. A new study reveals that chemical reactions within asteroids may have freed water, slowly covering the Earth in water. Usually, astronomers thought of water from space as coming from comets — essentially, dirty snowballs — from beyond the “ice line” of our Solar System, where water stays eternally frozen. This water would…

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