Earth Was Born With Water; No Delivery Needed

About 71% of Earth's surface is covered in water, and that's a defining feature of our planet and its habitability. The source of that water is still being debated and determined. Image Credit: EUMETSAT/ESA

The source of Earth’s water is one of the most compelling questions facing scientists. Earth’s habitability depends on multiple factors, but water is the basis for life, and it had to come from somewhere. Did comets and meteorites deliver it after Earth formed? Or did water become part of our planet as it formed?

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