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

17. An H-R Diagram plots the luminosity of stars against their:

20. Ninety percent of all stars (if plotted on an H-R diagram) would fall into a region astronomers call:

2. Which of the following statements about interstellar matter is FALSE?

35. Astronomers estimate that there may be a trillion (a thousand billion) comet nuclei orbiting beyond Pluto. Why then do we not see more comets in our skies?

18. Some objects in space just don?t have what it takes to be a star (just like many hopefuls in Hollywood don?t.) Which of the following is a ?failed star?, an object with too little mass to qualify as a star?

8. Why are astronomers much more interested in the luminosity of a star than its apparent brightness?

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

1. Which of the following is NOT a correct statement about the ways the jovian planets differ from the terrestrial planets?

12. According to the theory of plate tectonics,