Space crossword

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Across
  1. 3. You use this to travel in space.
  2. 5. A tubelike device containing material that burns rapidly and propels the tube through the air.
  3. 7. A person from another planet.
  4. 8. It's a piece of rock that looks like a bright star with a tail.
Down
  1. 1. It's a person a person trained for space flight.
  2. 2. You use this to look at stars and planets.
  3. 4. Celestial body revolving around a star, and illuminated by light from that star.
  4. 6. It's a special uniform for astronauts.