Star Lifecycle crossword

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Across
  1. 3. The pulling force between masses that holds stars together
  2. 4. A phase less massive stars enter after they have no more fuel to burn and begin to lose mass
  3. 10. The longest phase of a star's lifecycle, where it begins burning hydrogen
  4. 13. A phase stars enter after their main sequence, where their outer layers gradually expand
  5. 14. The pushing force within a star that increases with temperature and density
  6. 15. A rotating neutron star that regularly emits energy
Down
  1. 1. The first stage of a star's lifecycle, where it gathers mass from a nebula
  2. 2. A distant starlike object that emits massive amounts of energy
  3. 5. The chemical reaction that takes place in a star, where elements like hydrogen combine into bigger elements, releasing energy
  4. 6. A mass so dense that its gravity won't allow light to escape, sometimes left behind after a supernova
  5. 7. A group of stars, e.g., the Milky Way
  6. 8. An incredibly dense mass left behind after a supernova
  7. 9. A cloud of gases that is the birthplace of a star
  8. 11. An explosion of a red dwarf star, where a sudden drop in pressure causes the star to collapse on itself
  9. 12. A mass greater than a planet but less than a star