Space Crossword

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Across
  1. 4. What orbits around the Earth?
  2. 6. When a star explodes
  3. 8. The planet we live on
  4. 9. A system of stars
Down
  1. 1. A vehicle for space travel
  2. 2. I'm at the center of our solar system
  3. 3. A cosmic ball of rock, dust and frozen gases
  4. 5. A force that causes two particles to pull together
  5. 7. A cloud of dust and gas in space