In the Hubble classification scheme for spiral galaxies,the tightness of the winding of the spiral arms appears to be directly related to the
A) overall intrinsic size of the galaxy,or the diameter across the spiral arms.
B) number of globular clusters in the halo of the galaxy.
C) age of the galaxy,as determined from the age of its individual stars.
D) size of the central bulge of the galaxy.

Question

Quizplus · Accepted Answer

The tightness of the winding of the spiral arms in the Hubble classification scheme is directly related to the size of the central bulge of the galaxy. Galaxies with small central bulges have loosely wound spiral arms, while galaxies with large central bulges have tightly wound spiral arms.

In the Hubble Classification Scheme for Spiral Galaxies,the Tightness of the Winding