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Good question! The answer, THIS week, is "galaxies".

However, we don't know how much hydrogen there is in intergalactic space; for all we know, there's more free hydrogen between the galaxies than there is in all the stars. Alternatively, we might argue that most of the matter has already fallen into various black holes, or exists in some impossible-to-detect "dark matter". We know a tiny fraction of one-thousandth of one percent of everything that we need to know - and discovering all those answers will be the work of the next several thousand years.

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