No Air in Space
Name: Mark P.
Why is there no air in space?
When "space" began to form billions of years ago, gravity began to take over
in space-time wrinkles. So "matter" mostly hydrogen and helium began to
collect into galaxies, stars, etc. Since gravity always "wins" on the cosmic
scale, most elements (including gases, which I generalize from your term
"air") clumped into various celestial objects. Put over-simply "gravity"
swept space clean of matter between the various objects.
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Update: June 2012