Use the lecture modules, supplemental lectures and web to answer the following questions. Please be sure to read the questions thoroughly.

1. What are the distances for the following parallax angles (they are written in arcseconds) in parsecs AND kilometers? (1 parsec = 3.1 x 10¹³ km)

   a) .001"

   b) .08"

   c) .25"

2. Write about the Mass-Luminosity Relationship. Include information on how it was discovered, what kind of stars were used to determine this relationship and their properties that helped determine the masses of stars.

3. The PPI cycle is the primary fusion mechanism in main sequence stars. Please list out the equations and describe in words (no abbreviations) what products are on the left and right sides of the equations. For each stage, list out how much energy is released. You will need to google this last part. The units of energy will be in MeV (mega or million electron volts). If you have trouble finding it, try Proton fusion MeV PPI as search terms.

4. Do the same for the PPII cycle as question (3).

5. Describe the major differences between Globular Clusters and Open Clusters. Where in our galaxy are Globular clusters likely to be located and where are open clusters likely to be found. Attach an image of each kind of cluster to your submitted homework.