In a primordial, pregalactic gas cloud, what is believed to have been the MOST important condition that caused the cloud to become a spiral galaxy (as opposed to some other type of galaxy)?
A) The cloud started off with a lot of dust and heavy elements.
B) The initial rate of star formation was high.
C) The cloud started off flattened and disk-shaped before it collapsed.
D) The initial rate of star formation was low.

Question

Quizplus · Accepted Answer

A low initial rate of star formation allows the gas cloud to retain more angular momentum, leading to the formation of a disk structure characteristic of spiral galaxies.

In a Primordial, Pregalactic Gas Cloud, What Is Believed to Have