Across
- 4. shell of icy bodies that surrounds the solar system
- 5. these planets are also called terrestrial planets, solid rocky surfaces
- 7. 90% of stars are this type, all are going through nuclear fusion
- 8. remnants of formation of solar system composed of minerals, rock and mostly ice
- 9. belt that starts outside of Neptune's orbit and extends out into the solar system
- 10. colder area on the sun surface that appears dark
- 13. rocky remnants from the formation of the solar system
- 14. planet that doesn't have a clear path around the sun
Down
- 1. theory that states that the solar system started as a cloud of gas and dust
- 2. a natural satellite that orbits a planet or asteroid
- 3. sphere of gas held together by its own gravity
- 6. when Hydrogen atoms are pushed together at high pressure and create Helium
- 11. these planets are ice and gas giants
- 12. a spiral or elliptical system of billions of stars, gas, and dust