Stars and Orbits

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Across
  1. 2. Size of longest lasting stars
  2. 9. Stage of a star in equilibrium
  3. 11. Energy producing reaction in a star
  4. 12. Element of the Sun
  5. 13. Shape of an orbit
Down
  1. 1. Distance from a star for liquid water
  2. 3. Large, bright star
  3. 4. Hot and dim star
  4. 5. Lightless dead star
  5. 6. Phase of water best for life to exist
  6. 7. Brightness of a star
  7. 8. Birthplace of a star
  8. 10. When two hydrogen atoms fuse together