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Where did all the water in the universe come from?

Hi, water water everywhere--but where did it come from? Our solar system is made of star stuff, did our water form during a super nova? Can H2O exist in stars?

No, H20 cannot exist in stars, but H and O separately can. Hydrogen is the basic building material of the universe, created in the Big Bang. Oxygen is created by nuclear reactions in stars. If you put H and O together in the cold of space, you get H2O. There are enourmous amounts of water in space. In fact, nearly all of the oxygen in space is in the form of water or carbon monoxide. Similarly, most the carbon and nitrogen in space are also in their most hydorgenated forms: methane (CH4) and ammonia (NH3).

April 1999, Dave Kornreich (more by Dave Kornreich) (Like this Answer)

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