Life cycle of a star crossword

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Across
  1. 4. The most stable phase in the life of a star.
  2. 10. A region of space with gravity so strong that not even light can escape.
  3. 12. A massive star that fuses elements up to iron before collapsing.
  4. 13. A star that expands and cools after using up its hydrogen fuel.
  5. 15. The stage in a star's formation where light starts to be emitted.
Down
  1. 1. The process that powers stars by fusing hydrogen nuclei into helium.
  2. 2. A massive explosion marking the death of a large star.
  3. 3. An incredibly dense remnant of a supernova, formed from neutrons.
  4. 5. Created through nuclear fusion in stars, making up most of the matter in the universe.
  5. 6. The force that pulls particles together in a nebula to form a protostar.
  6. 7. The final, cooled stage of a star like the Sun, when it emits no light.
  7. 8. A cloud of dust and gas where stars begin their life cycle.
  8. 9. A hot, dense core left behind after a red giant sheds its outer layers.
  9. 11. Emitted during the protostar stage as particles collide.
  10. 14. The heaviest element formed through fusion in massive stars before a supernova.