The ______ theory offers a likely explanation for the formation of _____.
A) high rotation speed; spiral arms
B) density wave; Galactic bulge
C) density wave; spiral arms
D) high rotation speed; dark matter

Question

Quizplus · Accepted Answer

The density wave theory explains the formation and maintenance of spiral arms in galaxies, suggesting that these arms are areas of higher density that move through the disk of the galaxy.

The ______ Theory Offers a Likely Explanation for the Formation