space and universe

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Across
  1. 3. the third planet from the sun and densest planet in
  2. 4. system a group of planets around the sun
  3. 7. object turning around a planet
  4. 10. thick gaz layer on the planet's surface
  5. 11. pictures in the sky made by stars
Down
  1. 1. natural attraction between physical bodies
  2. 2. a star flying in the sky very fast
  3. 5. gravitationally curved path of an object around a point in space
  4. 6. rock which floats in space and can crash on a planet
  5. 8. solar system
  6. 9. big device which can bring people into space