STARS

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Across
  1. 5. Used to measure the distance light travels in one year
  2. 6. Object with such strong gravity it fuses elements
  3. 7. How many times hotter the surface of the sun is than a campfire
  4. 8. The stage of the life cycle our sun is in
  5. 9. So strong, even light cannot escape
  6. 11. Another name for the North Star
  7. 13. The densest element at the center of a star
Down
  1. 1. atoms becoming so hot they fuse together
  2. 2. The layer between the core and the surface
  3. 3. The least dense element at the surface of a star
  4. 4. When a low mass star uses all of its fuel
  5. 6. What happens when supergiants explode
  6. 10. The hottest layer of a star
  7. 12. The star that is closest to Earth