Across
- 3. a small planet-like body of rock that orbits a star
- 5. a system of objects that revolve around a star
- 6. to move around another object along a circular path, as in an orbit
- 11. electromagnetic energy
- 12. the study of the properties and behavior of bodies in outer space
- 14. a large circular mass that revolves around a star
- 16. a specific point in space
- 18. the large, empty part of the universe that does not contain any matter
Down
- 1. a body in outer space that orbits a planet; a natural satellite
- 2. the second planet from the sun
- 4. a small object made of rock or metal that orbits the sun
- 7. a person who travels outside Earth's atmosphere; a person who travels into space
- 8. 3rd planet from the sun/where we live
- 9. layers of gas that surround a planet
- 10. turning around on an axis; spinning
- 13. any star around which planets revolve
- 15. an interstellar cloud made up of hydrogen gas, plasma, helium gas, and dust
- 17. the circular path of an object as it revolves around another object