BLACK HOLES

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Across
  1. 2. A bright active galactic nucleus
  2. 3. The natural force that makes things fall to the ground when you drop them
  3. 5. Everything that exists including the planets, stars, space
  4. 8. A powerful, bright stellar explosion
  5. 9. The line where the earth and sky appear to meet
  6. 10. To send out something (a smell, a sound, heat,etc).
  7. 11. A large group of stars and planets in outer space
Down
  1. 1. A very small piece
  2. 4. Connected with astronomy
  3. 6. The brightness that allows you to see things
  4. 7. The speed at which something moves
  5. 8. The outside or top part of something