The image below is of a spiral galaxy. In spiral galaxies,the size of the central bulge is correlated with the:
A) tightness of the spiral arms
B) luminosity of the galaxy
C) age of the galaxy
D) thickness of the disk

Question

The image below is of a spiral galaxy.  In spiral galaxies,the size of the central bulge is correlated with the:
A) tightness of the spiral arms 
B) luminosity of the galaxy 
C) age of the galaxy 
D) thickness of the disk

Quizplus · Accepted Answer

The size of the central bulge in spiral galaxies is correlated with the tightness of the spiral arms. Galaxies with larger bulges tend to have tighter spiral arms, while galaxies with smaller bulges have more open spiral arms. This correlation has been observed across a wide range of spiral galaxy types and is thought to be due to gravitational interactions between the central bulge and the spiral arms.

The Image Below Is of a Spiral Galaxy