| A | B |
|---|
| What keeps a galaxy together? | gravity |
| how do scientists tell if a star is warm or cold | color |
| What is the process called when Hydrogen is changed to Helium | Nuclear fusion |
| A star can become classified as more than one star as it gets older | true |
| this is a small white star in its final stage of life | white dwarf |
| this is the star in its second and longest stage in life | main sequence star |
| this is a large cool star in its third stage of life | red giant |
| The H- R diagram shows the relationship of a stars temperature to its | brightness |
| The vertical plot of the H-R diagram tells what about a star | brightness or absolute magnitude |
| as you move to the right on an H-R diagram the temperature | lowers |
| this is an explosion in which a massive star collapses | supernova |
| a rapidly spinning neutron star | pulsar |
| a huge object from which light cannot escape | black hole |
| What two things does the H-R digram graph | temperature and brightness |
| Tell the three or four part sequence of a stars life cycle starting at its earliest | main sequence, red giant, white dwarf |
| the shortest stage in a stars life cycle is the main sequence | false |
| new stars form from old stars | true |
| what type of star has used up all its hydrogen and is leftover center of an old star | white dwarf |
| a cool star that has used up its hydrogen | red giant |
| it is difficult to locate _____ _____ because they don't give off any light | black holes |
| a hot star with no more hydrogen | white dwarf |
| a star made up of neutrons | neutron star |
| a huge explosion in which a star dies | supernova |
| a star in which the electrons and protons have become neutrons | neutron star |
| a star that expands and cools once it runs out of Hydrogen | red giant |
| a massive and dense object from which even light cannot escape | black hole |
| a spinning neutron star the emits rapid pulses of radio and optical energy | pulsar |
| the diagonal pattern of the H-R scale | main sequence |
