The Starword

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Across
  1. 2. The stage after high-mass star
  2. 5. stage before red giant
  3. 7. A completely cooled white dwarf
  4. 8. The smallest star
  5. 9. The stage after star and before planetary nebula
  6. 10. An extremely bright burst of light
Down
  1. 1. The blue/white core of the star when it cools
  2. 3. A singularity sucking everything in
  3. 4. A glowing cloud of gas
  4. 6. A star before nuclear fusion