Quote:
Originally Posted by HydrogenBond
If we had a huge galaxy size cloud of hydrogen gas, that had a center of gravity that was slightly denser, one would expect it to collapse/rotate due to gravity...
Gravity and the GR wells created in the fabric of space-time, are not just dependant on mass, but also mass density. Relative to the original cloud, we don't have much mass density (mass-distance), so the initial well at the center of gravity is more like a tiny puddle that will keep evaporating due to pressure and entropy of an ideal gas.
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A sphere of gas of
uniform density will collapse. It does not need a high density area in the middle. The center of a sphere of
uniform density has higher gravitational potential than the perimeter or the edge, so it will collapse.
~modest
