| A | B |
|---|
| Scientists think that the Milky Way probably is a | spiral galaxy |
| A main sequence blue star is the | hottest star |
| The H R diagram shows the relationship between star's surface temperature and its | absolute magnitude |
| A star's color indicates | its temperature |
| Scientists think that the universe will | expand forever |
| Eliptical galaxies and teh halos of spiral galazies contain groups of stars called | globular clusters |
| The pattern of lines in a star's absorption spectrum represents | some of the elements in the star's atmosphere |
| Black lines appear on an absorption spectrum where colors of light are | absorbed by a star's atmosphere |
| Scientists measure the distance from Earth to various galaxies as one way to | calculate the age of the universe |
| Cool bright red stars appear on the | bottom right of teh modern H R diagram |
| Which of the following is largest a nebula a galaxy a neutron star or a star cluster | a galaxy |
