Physical Cosmology

How would a galaxy form from the bottom up?
Answered by Science Channel
  • Science Channel

    Science Channel

  1. Both bottom-up and top-down galaxy formation theories revolve around gravity and its collapsing effects on gas in early galaxies. Bottom-up theories propose that this gas collapsed and compressed into clumps the size of a million suns. These smaller clumps (cosmically speaking) then got together to form enormous galaxies, like the Milky Way.

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