Some of Earth's water is older than the Sun.

Water feels like something that belongs to Earth, but some of it appears to have a much older origin story. Research on water chemistry in the Solar System indicates that not all of today's water formed locally after the Sun was born. Some water molecules likely survived from the cold interstellar cloud that existed before the Solar System formed. That means part of Earth's water story may predate the Sun itself. The same substance in oceans and glasses can carry a history older than the star it now orbits. That makes ordinary water feel cosmic.

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