Astro 201: Exercise - The Galaxy

1. How big is the Milky Way?
2. How many stars does it contain?
3. How long does it take the sun to revolve once around the Milky Way?
4. Make a two-column table, with columns disk and spheroid. Put the following in the appropriate column: spiral arms, open clusters, globular clusters, metal-poor stars, metal-rich stars, the sun, giant molecular clouds, dust, young stars, uniformly old stars, orderly near-circular orbits, chaotic orbits, bulge, and halo.