Comet Crossword

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Across
  1. 1. Cloud Region where comets come from
  2. 3. Small space probe that landed on 67/P
  3. 5. This comet was very bright in the sky in 1976
  4. 7. Comets are made of dusty what?
Down
  1. 2. Space probe that visited Comet 67/P
  2. 4. Comet that appears every 76 years
  3. 6. Stretches out behind the head of a comet