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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)?

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

32. Which of the following stages will our own Sun go through in the future:

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?