Across
- 1. labelled a distant planetoid; smaller than Pluto
- 3. smallest planet in our solar system
- 5. rocky objects that orbit the Sun
- 6. referred to as the "red planet"
- 8. second largest planet in our solar system; has very pronounced rings
- 10. life beyond Earth
- 11. planet referred to as Earth's sister
- 15. model of solar system with Earth at center
Down
- 2. planets in orbit around stars other than our Sun
- 4. composed of dust and rock particles, frozen water, methane and ammonia
- 6. sand- to boulder-sized objects in the solar system
- 7. largest planet in our solar system
- 9. model of solar system with Sun at center
- 12. planet that has mild temperatures that allow water to be a solid, liquid, or a gas
- 13. planet with 27 known moons and 13 faint rings
- 14. planet discovered in 1846; has a 165-year orbit around the Sun