I. For each question below, answer T for TRUE or F for FALSE. (2 pt. ea.)
1. T: Observations suggest that there is matter we cannot
directly observe in our galaxy.
2. T: The expansion of the universe is does not have a center.
3. T: The Big Bang theory predicted the existence of
the Cosmic Microwave Background radiation.
4. T: Because we know how distant galaxies are and
how fast they're moving, we can estimate the age of the universe.
5. T: Quasars are so far away they must be very luminous.
II. For each question, circle the answer that applies.(2 pt. ea.)
1. Astronomers see some material at the outer edge of
the Milky Way rotating (A: faster/slower) than Kepler's
Third Law would predict if most of the mass in the Milky Way
were near the galactic center,
where some matter is observable.
2. This means there is actually (A: more/less) mass toward the edge of
the Milky Way than expected from the amount of visible matter.
3. The cosmic microwave background spectrum arises from
(spectral lines/A: blackbody radiation).
4. Quasars exhibit highly (A: redshifted/blushifted) spectra.
III. Multiple choice (2 pt.):
The cosmic microwave background is currently at a temperature of
a) about 3 K <------ ANSWER
b) about 3,000 K