Space Rocks

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Across
  1. 1. are around nucleus
  2. 4. middle of comet
  3. 6. large rock
  4. 7. tail tail of dust on comet
  5. 8. fallen to Earth's surface
Down
  1. 2. shooting star
  2. 3. tail tail of gases on comet
  3. 5. ball of ice and dust
  4. 6. belt