1. If you look at a clear, dark sky at night, you can see a faint,

1. If you look at a clear, dark sky at night, you can see a faint,
white band of light across the sky that we call the Milky Way. Why does our galaxy look like a band of light across the sky? Why don’t we see that whiteness all over the sky?

2. Why do spiral galaxies look bluer than elliptical galaxies?

3. What causes natural selection to occur? (Note that a correct answer will not include the phrase, “survival of the fittest.”)

4. How old is the universe? How do we know?

5. Galaxy NGC-7619 is moving away from us at 4800 km/sec. What is the distance to this galaxy? (Hubble’s constant is 20 km/sec/M.l.y.)

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