Water is a very common substance, not just on Earth, but also in space. Although water usually occurs in space as a solid and occasionally as a gas and relatively rarely as a liquid, the most common compound is H₂. I believe based on the abundance of elements in the universe (ignoring helium because it is a noble gas) that water is the most common multielemental (having more than one type of element in its structure) compound. Are there more common ones, or is water the most common one?
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