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?

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

22. Measurements show a certain star has a very high luminosity (100,000 x the Sun’s) while its temperature is quite cool (3500o K). How can this be?

3. Which of the following statements about the main sequence stage in the life of a star is FALSE?

1. If you want to find stars that are just being born, where are the best places to search?

10. An astronomer wants to observe a cloud of cold neutral (not ionized) hydrogen, far away from any stars. What would be an instrument that could help in this task?

24. What do the surveys of the three-dimensional distribution of groups of galaxies reveal about how groups and clusters of galaxies are organized?