Here, we’ve discussed what scientists know so far about how water came to be on Earth, dating right back to the planet’s formation.
Billions of years ago, during the formation of Earth and other planets, scientists believe it began with a swirling protoplanetary disk around the newly formed sun.
Planetary scientists believe that if Earth’s oceans didn’t form when the Earth’s surface was formed, they would have had to arrive later via asteroids and comets.
If scientists became pretty certain that water on Earth came from asteroids, you might be wondering how comets fit into the equation.
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