Space puzzle

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Across
  1. 3. the layer of gases that surrounds the earth
  2. 5. device that orbit around earth
  3. 8. a person who travels in space
Down
  1. 1. a vehicle that travels in space
  2. 2. the largest planet in the solar system
  3. 4. the scientific study of stars,planets,etc.
  4. 6. to send or shoot a rocket into space
  5. 7. the 3rd planet from the sun