In the Hubble classification scheme for spiral galaxies,the tightness of the winding of the spiral arms appears to be related directly to the:

Question

Quizplus · Accepted Answer

The tightness of the spiral arms in spiral galaxies is related to the size of the central bulge of the galaxy. Galaxies with larger central bulges tend to have looser spiral arms, while galaxies with smaller central bulges have tighter spiral arms. This relationship is thought to be due to the gravitational influence of the central bulge on the surrounding disk of the galaxy.

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