The Cosmic Origins of Earth's Water

PBS_ItsOKToBeSmartPublished: December 15, 2018Updated: December 17, 2018
Published: December 15, 2018Updated: December 17, 2018

Why is Earth is a blue planet? Because it’s covered in water! Where did Earth’s water come from? Of course, water isn’t unique to our planet. The origin of water traces beyond the solar system to the earliest days of the universe. Here’s the story of the galaxy’s H2O.

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