Across
- 2. another word for the Northern lights
- 4. was once considered the ninth planet. Now a dwarf planet
- 6. known as the red planet. Traces of water can be found
- 9. large outer planets, made of mostly gases
- 12. a "hole" in the moon or other planet usually caused by the impact of a meteor
- 15. seventh planet from the sun
- 16. eight planet from the sun
- 18. this planet has many visible rings
- 19. space between Mars and Jupiter containing most asteroids
- 21. scientist credited with the discovery of gravity
Down
- 1. First planet from the sun
- 3. meteorite burning up in Earth's atmosphere
- 5. Second planet from the sun
- 7. debris and other materials orbiting giant planets like Saturn
- 8. this pulls everything down, making sure we don't fly into space
- 10. the center of our galaxy. Provides most of our heat.
- 11. the Roman goddess Venus is named after
- 12. Pluto's only moon
- 13. the largest planet
- 14. gases surrounding a planet
- 17. white space object orbiting Earth. Has many craters
- 20. the planet we live on