galaxies

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Across
  1. 4. first stage of a stars formation
  2. 5. a large cloud of gas
  3. 6. accurate scale of entire solor system
  4. 8. universe exploded
  5. 9. space and everything in it
  6. 10. the blue white core that is left behid and cools
  7. 12. a group of single stars
Down
  1. 1. the brightness the star would have if it were at a standard distance from earth
  2. 2. brightness seen from earth
  3. 3. provides enough energy to create the heaviest elements
  4. 7. distance that travels in one year
  5. 11. large telescopes have spectrographs to --- light