04/09/13 Quiz

1. How do we measure stellar masses? We can measure the mass by the spectral type.
2. What are giants, supergiants, and white dwarfs? Giants and supergiants are stars that are nearing the ends of their lives.  White dwarfs stars are the cooling embers of stars that have exhausted their fuel for nuclear fusion.
3. What are the two types of star clusters? Modest sized open clusters and densely packed globular clusters. 
4. How do we measure the age of a star cluster? By plotting their stars in an H-R diagram.
5. Do we know any star cluster 14 billion years old, or older? No
6. Which star has a longer life, small mass star, or big mass star? Small mass star.
7. Which star is hotter, small mass star, or big mass star? High mass stars.
8. Which star is bluer, small mass star, or big mass star? Big mass stars
9. Which star is closer, the Sun, or Proxima Centaurus? The Sun
10. What is the age of the Universe? 13.77 billion years old