Which of the following is true about irregular galaxies?
A)They are composed solely of old stars.
B)They generally have significant bulge populations.
C)They were more common when the universe was younger.
D)They have reddish colors.
E)They have well defined spiral arms.

Question

Quizplus · Accepted Answer

Irregular galaxies were more common in the early universe before they were tidally disrupted and merged into larger galaxies. This can be explained by the hierarchical model of galaxy formation, where small galaxies merge to form larger ones.

Answer: B
 Irregular galaxies do not have a regular shape or symmetry, and lack a defined bulge, spiral arms, or disk structure. They may have significant populations of young and old stars, as well as gas and dust.

Therefore, the best choices are C and B.

Which of the Following Is True About Irregular Galaxies