Unit 3 Vocab

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Across
  1. 2. a collection of stars,dust,and gas bound together by gravity
  2. 4. a large cloud of gas and dust in interstellar space;a region where stars are born
  3. 8. all the frequencies or wave lengths of electromagnetic radiations
  4. 10. the actual brightness of an object such as a star
  5. 12. the brightness of a star as seen from Earth
Down
  1. 1. Hertzsprung-Russell diagram a graph that shows the relationship between a star's surface temperature and absolute magnitude
  2. 3. a gigantic explosion in which a massive star collapses and throw its outer layers into space
  3. 5. space and all matter and energy in it
  4. 6. a measure of how bright a star would be if it were seen from a standard distance
  5. 7. a ster that has collapses under gravity to the point that the electrons and protons have smashed together to form neutrons
  6. 9. the distance that light travels in a year;about 9.46 trillion kilometers
  7. 11. a small ot dim star that is left over center of an old sun like stars