I. For each question below, answer T for TRUE or F for FALSE. (2 pt. ea.)
1. Observations suggest that there is matter we cannot
directly observe in our galaxy.
F: 2. A neutron star is more massive than a black hole.
T: 3. Once an object moves inside a black hole's event horizon, it cannot effect events outside the horizon.
F: 4. Our Sun lies in the galactic halo. (lies in disk)
II. For each question, circle the answer that applies.
1. Astronomers see stars at the outer edge of the Milky Way rotating (faster/slower) than Kepler's Third Law predicts if all mass is at the galactic center.
2. This means there is actually (more/less) mass toward the edge of the Milky Way than expected from the amount of visible matter.
3. Most visible gas, dust, and stars in the Milky Way lie in the galactic (disk/halo). (3 pt.) A: DISK
III. Multiple choice (1 pt.): The galaxy's diameter is
a) 100,000 ly <-- ANSWER
b) 1,000 ly
c) 1 million ly
d) none of the above
IV. Sketch a top or side view of the Milky Way,
and label the locations of the galactic center and the Sun. (3 pt.)
1 pt. for anything remotely looking like the galaxy,
1 pt. for the center at the center of whatever you drew,
1 pt. for the Sun about half of the way from center to edge.