Question

question 16
1 pts
what is the difference between an sbb galaxy and an sb galaxy?
the sbb galaxy has less tightly wound spiral arms than the sb galaxy.
the sbb galaxy has more tightly wound spiral arms than the sb galaxy.
the sbb galaxy is more elliptical than the sb galaxy.
the sbb galaxy has a bar of materi passing though the center and the sb galaxy does not.
the sbb galaxy is an irregular galaxy but the sb galaxy is not.

Explanation:

In galaxy classification, the "B" in SBb indicates a barred spiral galaxy (with a central bar of material), while Sb is an unbarred spiral galaxy. The tightness of spiral arms (denoted by lowercase letters like b) is the same for both Sb and SBb. SBb is not elliptical or irregular—both are spiral types.

Answer:

The SBb galaxy has a bar of material passing though the center and the Sb galaxy does not.