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