Noone. It was created that way.
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The universe is what we see in the sky. The universe was created by a big explosion, so noone 'hung up' the stars. Even the Sun is a star. Actually, it is a small star compared to others. The others are just so far away that they look very small.
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The laws of physics. God IS physics. "May the F = m x a be with you"
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...And from what are they attached to?
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I did.. so leave em alone