Across
- 2. the star that is the source of light and heat for the planets in the solar system
- 6. craft capable of traveling in outer space
- 8. the second nearest planet to the sun
- 9. the natural satellite of the Earth
- 11. the degree of hotness or coldness of a body or environment
- 14. The sun is a very hot ball of hydrogen and ______ gases
- 15. a collection of star systems
Down
- 1. largest planet in solar system
- 3. a celestial body that revolves around the sun
- 4. a person trained to travel in a spacecraft
- 5. This planet named after Roman god of war and agriculture
- 7. the layer of gases surrounding any celestial body
- 10. a small celestial body composed of rock and metal
- 12. the galaxy containing the solar system
- 13. rocky planet