Since water is one of the vital ingredients for life on Earth, scientists want to know how it got here. One theory is that the water in our solar system was created in the chemical afterbirth of the Sun.
If that were the case, it would suggest that water might only be common around certain stars that form in certain ways. But a new study by scientists from the University of Michigan suggests that at least some of Earth's water actually existed before the Sun was born - and that it came from interstellar space.
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