Galaxies

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Across
  1. 3. all of space and everything in it
  2. 6. Blue white core that is left behind cools
  3. 7. brightness the star would have if it were at a standard distance from earth
  4. 8. brightness as seen from Earth
  5. 11. Large cloud of gas and dust containing an immense volume of material
  6. 12. accurate scale of the entire solar system
Down
  1. 1. Brilliant explosion of a dying supergiant star
  2. 2. distance that light travels in one year
  3. 4. Large telescopes have spectrographs
  4. 5. the explosion resulting in the formation and expansion of the universe
  5. 9. A contracting cloud of gas and dust with enough mass to form a star
  6. 10. a group of single stars