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

Question

Quizplus · Accepted Answer

Spiral galaxies are classified based on the size of their nuclear region and the winding of their arms. "Moderate size and moderately wound arms" correspond to Sb galaxies according to the Hubble classification system.

An Astronomer Studying a Distant Cluster of Galaxies Finds That