Space Crossword!!

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Across
  1. 1. Large chunks of ice, dust, and rock
  2. 5. Massive collections of gas
  3. 7. Piece of metal or rock
  4. 8. huge collection of gas, dust with billions of stars and planets
Down
  1. 2. Falling and rising of bodies of water
  2. 3. Large celestial objects
  3. 4. Study of space
  4. 6. Everything that exist
  5. 7. type of satellite