1) I take a spectrum of a star that has an absorption line at 487.0~nm. In the lab, this same line occurs at 486.1~nm. What is the redshift (z) of this star?
2) Which population of stars has no metals?
3) What is dark matter?
a) Faint stars.
b) Black holes.
c) Exotic particles that don't interact with light.
d) Regular stars that are blocked by gas.
e) Darths Sidious, Vader, Maul, and Tyranus.
4) What type of galaxy is pictured above?
5) What is the distance of a galaxy with a redshift velocity of 36,000 km/s? Use Ho=72 km/s/Mpc
6) What type of galaxy is pictured above?
7) If you could travel at the speed of light, which of these journeys would be the shortest?
a) To our nearest neighbor star (not the Sun).
b) To Pluto.
c) To the center of our galaxy.
d) To Andromeda (our neighbor galaxy).
e) To the Virgo Cluser of galaxies.
8) What type of galaxy is pictured above?
9) List 3 ways that the Milky Way galaxy will be different in the distant future (say, in another 10 billion years).
10) What are the characteristics of stars in the bulge of a spiral galaxy?
11) What are the characteristics of stars in the disk of a spiral galaxy?
12) What type of galaxy is pictured above?