What factors are important when trying to classify a spiral galaxy
A)amount of dust and gas in the galaxy
B)structure of the spiral arms
C)size of the central region
D)All of the other choices are important.

Question

Quizplus · Accepted Answer

All of the given factors are important when trying to classify a spiral galaxy. The amount of dust and gas determines the amount of ongoing star formation in the galaxy, the structure of the spiral arms displays how well-defined and tightly wound they are, and the size of the central region can reveal whether it is actively forming stars or not. Other important factors could include the color and spectral properties of the galaxy, the presence or absence of a bar or ring structure, and the overall shape and appearance of the galaxy. Therefore, D is the best choice because it encompasses all of the important factors.

What Factors Are Important When Trying to Classify a Spiral