What is the basic shape of a spiral galaxy?
A) A round,thin disk of uniform brightness with its edges bent up and down into a spiral shape
B) A round,flat disk with long lanes of stars that curve outward in a spiral shape from the very center of the galaxy
C) Approximately spherical with long lanes of dark dust clouds curving through it in a spiral pattern
D) A round,flat disk containing long lanes of stars that curve outward in a spiral shape from the edge of a round,nuclear region of uniform brightness

Question

Quizplus · Accepted Answer

Spiral galaxies have a flat, rotating disk containing stars, gas, and dust, with a central bulge of older stars. The spiral arms extend from the central bulge, not from the very center or the edge.

What Is the Basic Shape of a Spiral Galaxy