32. Planets in the habitable zone of their stars:

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

16. If a galaxy contains a great deal of ?dark matter,? what will that do the galaxy?s mass-to-light ratio?

33. Astronomers were surprised to find so many Jupiter-mass planets so close to their stars. According to their best theories and models, such ?hot Jupiters?

5. The hottest zone in the Sun is the

13. When the mass of a star’s core is greater than 1.4 times the mass of the Sun, degenerate electrons can?t keep it stable as a white dwarf. Instead, it becomes:

10. Our Milky Way Galaxy is what type of galaxy?

31. When neutron stars were first predicted theoretically, no scientist expected to be able to detect one of them across interstellar distances. What enabled astronomers to find neutron stars in the late 1960’s?

28. According to the models of the universe we discussed in this course, why do the galaxies move apart (why do we have Hubble’s law)?

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