An astronomer studying a distant cluster of galaxies finds that several of the galaxies are spiral-shaped, with a large nuclear region and tightly wound arms. How should the astronomer classify these galaxies?
A) Sb
B) SBb
C) Sa
D) Sc

Question

Quizplus · Accepted Answer

Galaxies with a large nuclear region and tightly wound arms are classified as Sa type in the Hubble sequence. This classification indicates a spiral galaxy with relatively little space between the arms and a prominent central bulge.

An Astronomer Studying a Distant Cluster of Galaxies Finds That