Black holes for Henry

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Across
  1. 1. The inner region of a black hole, where the object's mass lies
  2. 7. Large star explosion
  3. 8. A theoretical ‘tunnel’ through spacetime
  4. 12. Process of an object being torn apart by a black hole's tidal forces
  5. 14. The boundary of no escape
  6. 17. Most common type of black hole
  7. 18. Abbreviation for Sagittarius A*
  8. 19. A sub-atomic particle that has a neutral charge
Down
  1. 2. What a black hole loses that reduces its mass
  2. 3. First predictor of black holes in 1916
  3. 4. Acronym for America’s civil space space exploration agency
  4. 5. Previous name for a black hole
  5. 6. A black hole that features angular momentum
  6. 9. hypothetical black holes that formed shortly after the Big Bang
  7. 10. Electric charge, angular momentum and what are the properties of a black hole?
  8. 11. The event that gave rise to Sagittarius A*
  9. 12. Nearest known white dwarf
  10. 13. The smallest size a black hole can reach is called a ___ Length
  11. 15. What do black holes slow?
  12. 16. The process of drawing matter inward