Across
- 2. a continuos area or expanse that is free
- 6. A large object orbiting a star
- 8. A natural satellite of a planet
- 10. A space vehicle that lands on another planet or moon
- 11. The path that a planet takes around a star
- 12. Anything that orbits a planet or moon
- 13. The force of attraction between any two objects
- 14. An unnamed spacecraft that has cameras and other equipment to find out about other planets
- 15. The unit of force
- 17. A small rocky body orbiting the sun
- 18. Relating to, or determined by the sun
Down
- 1. The amount of matter that something is made of
- 3. The american space program for landing astronauts on the moon
- 4. An optical instrument designed to make distant objects appear nearer
- 5. A small lump of dirty ice orbiting the sun
- 7. The star around which earth orbits
- 9. A space probe that goes into orbit around a planet or moon
- 12. A vehicle used for traveling in space
- 16. Millions of stars grouped together
- 18. A huge ball of gas that gives out heat and light energy