SPACE

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Across
  1. 2. a piece of rock or other matter from space that produces a bright light
  2. 5. a person who is trained to travel in a spacecraft.
  3. 7. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
  4. 9. the red planet
  5. 10. the farthest planet from the Sun
  6. 11. the planet on which we live
Down
  1. 1. a cylindrical projectile that can be propelled to a great height or distance by the combustion of its contents, used typically as a firework or signal.
  2. 3. the natural satellite of earth
  3. 4. around this planet revolve planar concentric rings
  4. 6. seventh planet in distance from the Sun and the least massive of the solar system's four giant
  5. 8. the largest of the planets
  6. 9. the smallest planet and closest to the Sun