What is the Origin of Water on Planets?

What is the origin of water on planets? Did it come from cometary impacts, or did water form naturally on Earth and Mars? A Martian asteroid may hold the answer.

Mars was once a water world. So, where did the water there — as well as on Earth — come from? A new study of a martian meteorite could hold the answer. Image credit: NASA/GSFC

Water covers around three-quarters of Earth, and it can be found on other worlds of the Solar System, including sub-surface deposits of ice on Mars. One of the great questions in planetary science today is attempting to understand how…

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The Cosmic Companion

The Cosmic Companion

Writing about space since I was 10, still not Carl Sagan. Weekly video show, podcast, comics, more: www.thecosmiccompanion.net