Blog

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

26. Astronomers observe the Small Magellanic Cloud (SMC), a not very dense, rather small galaxy near us. They notice that even those stars that formed recently have relatively few heavier elements (when compared to such recent stars in our Milky Way.) What is the likely explanation for this deficiency?

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?