Black Holes and Space Crossword

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Across
  1. 5. black holes come from _____ that have reached the end of their lives
  2. 6. the main topic of this crossword
  3. 7. the compressed matter at the center of a black hole
  4. 8. the stretching and compression that would happen if you got too close to a black hole
  5. 10. its own gravity to form a black hole
  6. 11. what time outside were to theoretically do if you entered a black hole
  7. 13. light and sound become _______ inside black holes
  8. 15. the event horizon marks the point where the ______ _______ is equal to the speed of light
  9. 16. a common mistake is that a black hole is a ______, but black holes don't actually suck things in
  10. 19. the nearest black hole is 1,600 _______ away from Earth
  11. 20. the continuum that ceases to exist in a black hole
Down
  1. 1. the "point of no return"
  2. 2. things that can escape a black hole
  3. 3. the name of the black hole at the center of the Milky Way
  4. 4. the singularity of a black hole has infinite _______
  5. 8. an exploded star that can become a black hole
  6. 9. a supernova must be at least _______ times heavier than the sun
  7. 12. the abbreviation for the telescope that captured the first photograph of a black hole
  8. 14. the number of elements you can find in a black hole
  9. 17. an old star that has collapsed
  10. 18. more than massive