An astronomer studying a cluster of galaxies finds a galaxy that is round and has a disk and central bulge like a spiral galaxy but has no spiral arms. How should the astronomer classify this galaxy?
A) E0
B) E7
C) Sa
D) S0

Question

Quizplus · Accepted Answer

The correct classification for a galaxy that is round, has a disk and a central bulge like a spiral galaxy but lacks spiral arms is S0, also known as a lenticular galaxy. This type bridges the gap between elliptical galaxies (E) and spiral galaxies (S), featuring characteristics of both but without the defining spiral arms of the latter.

An Astronomer Studying a Cluster of Galaxies Finds a Galaxy