SPACE

3. an object in outer space, made of hot gases, that can be seen in the night sky
5. to revolve around another object
8. a large, round object that travels around a star
9. Earth's only natural satellite
10. to move in a circle around something
11. a large group of stars, planets, gases and dust
14. all things that exist in space
15. a scientist who studies stars, planets, comets, and other things found in space
16. one complete circle made by a planet along its orbital path around another celestial body
17. the closest star to Earth and the center of this solar system

1. an imaginary line around which an object, such as Earth, rotates
2. a natural or human-made object that orbits Earth or another object
4. to turn on a center or axis; spin
6. a small, rocky object that orbits the sun
7. a space object made of ice and dust that develops a long, bright tail as it nears the star it orbits
10. a single turn of something around an axis or a fixed point; spinning
12. a person trained to travel and work in space
13. the natural force that tends to pull objects toward each other