black holes

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Across
  1. 4. what does a black hole have to suck up to grow bigger?
  2. 5. what do you need to look at to find a black hole?
  3. 9. what does an object need to do to make a black hole detectable?
  4. 10. what is the point of no return on a black hole called?
  5. 11. when was the first picture of a black hole taken?(in words)
  6. 12. when was the first black hole prediction made?(in words)
  7. 14. what do 2 black holes sound like when colliding?
  8. 16. what type of stars collapse to form a black hole?
Down
  1. 1. what is the largest type of black holes called?
  2. 2. how many light years away is the closest black hole?
  3. 3. the largest black holes are in the center of what?
  4. 6. what can be consumed by a black hole?
  5. 7. why is a black hole so hard to find?
  6. 8. who can travel into a black hole?
  7. 13. what has to collapse to make a black hole?
  8. 15. what does a person have to have to discover a black hole?