05/02/2013 Quiz

1. What do halo stars tell us about our galaxy's history? They tell us about the collisions between galaxies.
2. How did our galaxy form? a large cloud of dust contracted together.
3. What lies in the center of our galaxy? massive black hole.
4. What are the three major types of galaxies? spiral, irregular, and elliptical.
5. How are galaxies grouped together? In clusters
6. How do we measure the distances to galaxies? We measure the light they emanate.
7. What is Hubble's law? H=V/D
8. How do distance measurements tell us the age of the universe? We can tell how much the universe is expanding from a central point.
9. Name a galaxy nearby. Milky Way
10. What is the mass of the black hole in the center of the galaxy? 4,000,000 times the mass of our sun.