Astronomy Crossword

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Across
  1. 2. end stage of supermassive stars
  2. 3. the rise and fall of sea levels that usually occur twice daily
  3. 5. most massive and luminous stars found above the main sequence
  4. 6. a galaxy shaped like a pinwheel
  5. 9. systems of dust, gas, stars and interstellar matter
  6. 10. a spherical or elongated galaxy with a bright center and very little dust
  7. 12. the diagonal region on the H-R diagram where stars spend most of their lives
Down
  1. 1. chemical reaction where the nucleus of two atoms combines
  2. 4. a galaxy with no specific shape
  3. 7. when a star or galaxy is moving away from the spectrum
  4. 8. a large cloud of dust and gas where stars are born
  5. 11. ocean water that is pulled away from the shorelines