Unit 3 Vocab

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Across
  1. 2. a small hot dim star that is left over center of an old sun like star
  2. 4. a collection of stars, dust, and gas bound together by gravity
  3. 7. space and all the matter and energy in it
  4. 9. the actual brightness of a star
  5. 10. the brightness of a star as seen from Earth
  6. 12. the distance that light travels in a year
Down
  1. 1. a gigantic explosion in which a massive star collapses and throws its outer layers into space'
  2. 3. all of the frequenciesor wavelengths of electromagnetic radiation
  3. 5. a measure of how bright a star would be if it were seen from a standard distance
  4. 6. a star that has collapsed under gravity to the point that the electrons and protons have smashed together to form neutrons
  5. 8. where stars are born
  6. 11. Hertzsprung Russell diagram a graph that shows the relationship between a star's surface temperature and absolute magnitude