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Empty Space




I have two questions -- well, actually I have a lot more, but I am going to
tell the list of only two -- unless I think of another while I type:

1) What would it mean to say that space is empty? Empty of what?

2) What is the density of "empty" space"? For example how much mass is
there "between" Sol and a-Centauri?


Jim.Green@Snow.edu