9. Which color star is likely to be the hottest?

3. When astronomers discuss a nebula, what are they talking about?

10. Which law do astronomers use to determine the masses of the stars in a spectroscopic binary system?

5. Astronomers today know a lot about the size and shape of the Milky Way Galaxy. Which of the following common objects most resembles the shape of our Galaxy?

11. A star whose temperature is increasing but whose luminosity is roughly constant moves in what direction on the H-R diagram?

3. When a single star with a mass equal to the Sun dies, it will become a

14. What evidence can you give that shows the surface of Jupiter?s moon Europa must be relatively young?

15. Objects orbiting around the center of the Milky Way obey Kepler’s 3rd Law. This means that:

25. At their centers, all the jovian planets have cores made of:

35. Which of the following statements about Saturn’s rings is TRUE?