black holes, neutron stars, and pulsars

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Across
  1. 4. the center of a black hole
  2. 5. speed needed to escape from the gravitational pull of another object
  3. 7. Neutron stars are ____ sized
  4. 8. the unit of measurement for measuring mass in the universe
  5. 12. All matter tends to warp or curve ____ in its vicinity.
  6. 13. when a star explodes
  7. 15. nothing can escape it once it enters
  8. 17. What happens when you get too close to a black hole
  9. 18. Critical radius at which the escape speed of an object would equal the speed of light
  10. 19. The type of star that has immense gravity and is about the size of a city
  11. 20. Interaction which causes mutual attraction between all things with mass or energy
Down
  1. 1. Rotating neutron stars observed to have pulses of radiation at very regular intervals
  2. 2. The core of a star collapses into a black hole while simultaneously a burst of gamma rays races outward, implodes onto the black hole forming a accretion disk and a relativistic jet.
  3. 3. _____ pulsars spin hundreds of times per second
  4. 6. neutron stars have a very strong _______ field
  5. 9. Neutron stars are ______ times denser than a white dwarf
  6. 10. Time gets ______ as you get closer to a black hole
  7. 11. blue light shifts to red light
  8. 14. Once light enters it cannot escape
  9. 16. _____ can travel faster than the speed of light