Spiral Galaxies Quiz

What is a distinctive feature of spiral galaxies?

• They lack a nucleus.

• They are the smallest galaxies in the universe.

• They are composed entirely of dark matter.

• They have a distinct nucleus and one or more spiral arms.

What do the spiral arms of a galaxy contain?

• Stars, dust, and gas

• Only dust

• Only gas

• Only stars

What percentage of bright stars observed in the Universe are contained in spiral galaxies?

• Less than 50%

• More than 75%

• Exactly 75%

• More than 50%

Where are Population I stars found in spiral galaxies?

• Outside the galaxy

• In the disk

• In the nucleus

• In the halo

What distinguishes a barred spiral galaxy from a normal spiral galaxy?

• It has no nucleus.

• It has an elongated center, called a bar, with arms coming from each end.

• It lacks spiral arms.

• It contains only Population II stars.