THIS DAY IN SCIENCE: Ford Model T - 1st Car On Assembly Line, Cost $825 in 1908

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The Cosmic Origins of Earth’s Water

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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