Space Themed Crossword

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Across
  1. 3. A system of stars, gas, and dust held together by gravity.
  2. 5. Earth's natural satellite.
  3. 6. A vehicle designed for space travel.
  4. 8. A vehicle used to travel into space.
  5. 9. A creature from another planet.
  6. 10. A celestial object with a tail of gas and dust.
Down
  1. 1. The star at the center of our solar system.
  2. 2. A large celestial body orbiting a star.
  3. 4. A person who travels to space.
  4. 7. Huge balls of gas that shine in the night sky.