Mostly empty

My researches show that the average densiity of the universe is about one atom per cubic meter. 

 That isn't very much, is it? I mean, there's an awful lot of atoms in a galaxy and there are an awful lot of galaxies. In that case there must be awful awful lot of very empty space.

 Then I got to thinking, how do you measure the density of the universe anyway? 

 Oh yes. First you measure its volume then you weigh it. Simples.

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