1. Even though the “spiral arms” of a galaxy produce over half the light of the

Question

1. Even though the “spiral arms” of a galaxy produce over half the light of the galaxy, about how much percent more stars do the spiral arms have compared to the areas between the arms? A. 5% B. 50% C. 100% D. 70%

2.What type of stars do elliptical galaxies primarily contain? A. Population I B. The heaviest stars C. Old, long-lived stars D. Young stars E. Bluer stars.

3.A galaxy may show a huge burst of new star formation, likely but not necessarily due to the collision or close passage of another galaxy. What type of galaxy is this called? A. Elliptical galaxy B. Interacting galaxy C. Peculiar galaxy D. Starburst galaxy

4.The fact that galaxies are moving much faster than expected inside a cluster of galaxies provides evidence for the existence of what type of material? A. Dark nebulae B. Gas and dust C. Photons D. Neutrinos E. Dark matter

5.There are types of object in space that always have the same luminosity (“absolute magnitude”). We can judge distances by how faint or bright they appear from Earth. What is the general term for these? A. Cepheid variables B. Standard candles C. Standard luminosities D. Supernovae E. Standard magnitudes

Explanation / Answer

1. D. 70%

2.C. Old, long-lived stars

3.D. Starburst galaxy

4. E. Dark matter

5.C. Standard luminosities

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