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Across
  1. 3. a large cloud of dust and gas in interstellar
  2. 6. star a star that has collapsed under gravity that electrons and protons that have smash together to form the neutron
  3. 7. diagram Hertzsprung-Russell diagram a graph show the relationship between a star's surface and absolute magnitude
  4. 8. magnitude how bright a star is from the earth
  5. 9. actual brightness of something
  6. 11. magnitude the distance measured how bright the star is from a standard distance
Down
  1. 1. dwarf a hot small dim star like an old sun like star
  2. 2. spectrum the frequencies or wavelengths of electromagnetic radiation
  3. 4. matter and energy in it
  4. 5. year a distant that light travels in years
  5. 10. collection of stars dust and gas bound together by gravity