universe crossword puzzle

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Across
  1. 1. a huge collection of gas, dust, and billions of stars and their solar systems
  2. 3. giant a giant planet composed mainly of hydrogen and helium
  3. 5. luminous ball of gas
  4. 7. containing billions of galaxy
  5. 8. orbiting the earth
  6. 9. hole nothing can escape this
  7. 11. planet Pluto was reclassified as this in 2006
Down
  1. 2. year distance that light travels in one year
  2. 4. a powerful and luminous stellar explosion
  3. 6. star at the center of the solar system
  4. 8. piece of stony or metallic debris
  5. 10. the third planet for the sun