Some simple questions about the astronomy,big bonus return!?

1.Consider the end of a star's life. If it is like our sun, it will finish burning off hydrogen, blow off its envelope, and leave a carbon core that is hot but not nearly as luminous as the giant stage previously. These objects are called:


a eclipsing binary stars. b. supernovae. c white dwarfs. d. brown dwarfs.





2Which is NOT used by astronomers to trace out the spiral structure of the Galaxy?


a. K and M stars. b. H II regions. c Giant molecular clouds. d. O and B stars.





3.Which part of the Galaxy contains many old Population I stars?


a. Nuclear bulge. b. Spiral arms. c. Halo. d Core.





4.How do we map out the structure and size of the arms in our galaxy?


a. Using a space probe at the galactic centre.


b. With a Norton's Star Atlas.


c. Using the observation of Cepheid Variable stars.


d. With observations of globular clusters





5.The rotation curves of distant spiral galaxies let astronomers measure their:


a. red shift. b. distance. c. age. d. mass distribution

Some simple questions about the astronomy,big bonus return!?
1. c


2. a


3. a, c, d


4. c


5. d
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