Black Holes and Neutron Stars

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Across
  1. 2. this force causes everything to fall to the ground
  2. 5. the concept of four dimensional space with time
  3. 6. the minimum speed needed to escape gravity
  4. 8. neutron star that has strong magnetic field
  5. 9. give such a steady pulse that they seem artificial
  6. 13. the theory of gravity made by Einstein
  7. 15. the theory that black holes radiate thermal energy
  8. 16. an area with infinite density and mass
  9. 18. a huge explosion that occurs when a star dies
  10. 19. blue stars the size of cities
  11. 20. the brightness of an object
Down
  1. 1. not even light can escape
  2. 3. he came up with hawking radiation
  3. 4. at this point there is no turning back
  4. 7. the explosion caused when a star dies and becomes a neutron star or black hole
  5. 10. the field of magnetism around objects
  6. 11. two stars revolving around each other
  7. 12. a type of electromagnetic radiation thathas the highest energy
  8. 14. very densely packed matter in a neutron star, named after food
  9. 17. the process of objects stretching out