Space as a reference point
Date: 1993 - 1999
I would like to know if the black part is gas and could
be a reference poi for finding objects in motion
By the black part, I mean outer space.
The density of gas in most of nearby space is about one atom or
ion per cubic meter, so it is very low density. We do not need
to have any gas present to measure the motion of objects in space.
One of the current questions about the black part of space is
how much cold and therefore invisible mass there is out there.
Some new experiments are starting to suggest there is much "dark
matter" out there.
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Update: June 2012