The universe

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Across
  1. 3. a galaxy with no specific shape
  2. 4. the diagonal region on the hr diagram
  3. 6. end stage of supermassive star
  4. 8. most massive and luminous star
  5. 9. the theory that all matter and energy in the universe was compressed into a single point
  6. 10. a galaxy shaped like a pinwheel,with a central nucleus
  7. 11. The spiral-shaped galaxy in which the sun and earth's solar system are located
  8. 13. hot dense dim core of matter
  9. 14. chemical reaction where the nucleus of 2 atoms make a new element
Down
  1. 1. a spherical or elongated galaxy with a bright center
  2. 2. a graph that shows the surface temp of a star
  3. 5. a large cloud of dust and gas
  4. 7. systems of dust, gas, stars
  5. 8. category a star is classified based on the surface temp
  6. 12. the brightness of a star