Reference no: EM13274356

Part -1:

1. Describe the three main layers of the Sun's interior.

2. What do astronomers mean by a "model of the Sun"?

3. What is a neutrino, and why are astronomers so interested in detecting neutrinos from the Sun?

Part -2:

1. Stellar parallax measurements are used in astronomy to determine which of the following properties of stars? a. speeds, b. rotation rates) c. distances, d. colors, e. temperatures.

2. Briefly describe how you would determine the absolute magnitude of a nearby star.

3. What is the mass-luminosity relation? To what kind of stars does it apply?

Part -3:

1. What is the lowest mass that a star can have on the main sequence? a. There is no lower limit, b. 0.003 Mo, c. 0.08 Mo, d. 0.4 Mo, e.2.0 Mo.

2. On what grounds are astronomers able to say that the Sun has about 5 billion years remaining in its main-sequence stage?

3. How is the evolution of a main-sequence star with less than 0.4 Mo fundamentally different from that of a main-sequence star with more than 0'4 Mo?

Part -4:

1. A white dwarf is composed of primarily a. neutrons, b. hydrogen and helium, c. iron, d. cosmic rays, e. carbon and oxygen.

2. What is the Chandrasekhar limit?

3. Compare a white dwarf and a neutron star. Which of these stellar corpses is more common? Why?

Part -5:

1. Supermassive black holes are found in which of the following locations?

a. in the centers of galaxies, b. in globular clusters, c. in open (or galactic) clusters d. between galaxies, e. in orbit with a single star

2. If the Sun suddenly became a black hole, how would Earth's orbit be affected?