Astronomy Questions


Answer all questions that are on the attachment. Doesn’t have to be long but at least to the point

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Astronomy 141:
Homework #5
1. You identify a star as having a G2 type spectrum, and you are told that the star is
much more luminous than the Sun.
a. Compare the temperature and radius of the star to those of the Sun. Hint:
The Sun also has a G2-type spectrum. (4 points)
b. Where on the HR diagram would you expect to find the mystery star? (1
2. Explain the events leading up to a core-collapse supernova. What type of stars
should produce a core-collapse supernova at the ends of their lives? (3 points)
3. Horizontal branch stars include two distinct sources of power. Sketch and label a
diagram of the inside of a horizontal branch star showing the location of each of
these two sources of energy. (2 points)
4. Answer the following questions using Hubble’s Law:
a. You observe two galaxies moving away from the Milky Way. Galaxy A
has a speed of 500 km/s and Galaxy B has a speed of 750 km/s. Which
galaxy is further away? (1 point)
b. Consider Galaxies A & B from part a). How much farther from the Milky
Way is the more distant galaxy compared to the closer one? Express your
answer as a ratio. (2 points)

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