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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?

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?

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

5. The hottest zone in the Sun is the

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: