Which of the following statements is not an assumption used in models of galaxy formation?
A)The universe started out filled almost uniformly with hydrogen and helium.
B)Gas contracted to form the disks of galaxies before any stars were born.
C)The universe is expanding.
D)Some regions in the universe were slightly more dense than others.

Question

Quizplus · Accepted Answer

Models of galaxy formation generally assume that stars began to form in galaxies before the gas in those galaxies settled into disks. This is contrary to the statement in option B, which suggests that gas contracted to form the disks of galaxies before any stars were born.

Which of the Following Statements Is Not an Assumption Used