Astronomers do not currently know what process stops the contraction, in fact theories of disk galaxy formation are not successful at producing the rotation speed and size of disk galaxies.
In fact, theories of disk galaxy formation are not successful at producing the rotation speed and size of disk galaxies. Astronomers do not currently know what process stops the contraction.
Astronomers do not currently know what process stops the contraction. In fact, theories of disk galaxy formation are not successful at producing the rotation speed and size of disk galaxies.
Astronomers do not currently know what process stops the contraction. In fact, theories of disk galaxy formation are not successful at producing the rotation speed and size of disk galaxies.