What happens after a star dies?

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Across
  1. 3. as neutron stars die, they
  2. 9. as black holes die, they
  3. 10. a star becomes a black hole when it as a mass greater than ___ solar masses
  4. 11. neutron stars are composed of these
  5. 12. a neutron star is born following an explosion called a
  6. 14. neutron stars emit intense X-__
  7. 15. black holes are not __ to the naked eye
Down
  1. 1. pulsars emit radiation at regular
  2. 2. neutron stars have a very strong
  3. 4. not even ___ can escape a black hole
  4. 5. black holes have the strongest ___ in the universe
  5. 6. type of black hole in the center of the milkyway
  6. 7. whether a star remains as a neutron star or becomes a black hole depends on
  7. 8. outer boundary of a black hole
  8. 13. type of neutron star that rotates and has pulses of radiation