Where do comets get their water from?

15 November 2009

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Question

Where do comets get their water from?

Answer

We posed this question to Dr Mark McCaughrean...Yes, I think one of the things you have realize is that when the solar system was very young, it was very much hotter. And so, you had a lot of water in the solar system, but out at about Jupiter was pretty much evaporated off or incorporated into places like the Earth. But the comets are very big lumps of icy dust and muck still leftover from the early part of the formation of the solar system. It's just leftover stuff.

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