Across
- 3. the blue planet
- 8. German astronomer that determined planets orbit in a ellipse, rather than a circle
- 9. oval shape that is centered on two points
- 12. _____________ 10 was the probe that collected most data of Mercury
- 14. one of mars's moons
- 16. (2wds) the apparent backward motion of a planet
- 18. (2wds) the largest volcano on Mars
- 19. belt in the region around Pluto where large object orbit
- 20. Jupiter has more _________ than any other planet in the solar system
- 23. force than pulls spinning objects inward
- 24. Kepler's _______ Law states that planets orbit faster near the sun
- 25. the earliest stage of a planet's development
- 28. (2wds) another name for the outer planets
- 30. the largest moon of Neptune
- 31. largest planet in the solar system
- 32. strong force that keeps the planets orbiting the sun
- 33. on Jupiter the high, light-colored clouds that rise
Down
- 1. type of planet classification of Pluto and Ceres
- 2. the brightest planet in the sky
- 4. the cliffs on Mercury
- 5. another name for the inner planets--those closest to the sun
- 6. Venus' atmosphere has a _____________ effect similar to Earth
- 7. another name for sun-centered
- 10. the red planet
- 11. Polish scientist who suggested the sun was the center of the universe
- 13. (2wds) average distance from the Earth to the sun
- 15. on Jupiter the low, warm, dark-colored clouds that sink
- 17. Saturn's most striking feature
- 21. Jupiter has an unusual layer of liquid metallic ______________
- 22. these caps cover the polar regions of MArs
- 26. the planet closest to the sun
- 27. the clouds on Venus are made of _______________ acid
- 28. Italian scientist that used a telescope to observe the sky
- 29. Saturn's moon that is larger than the planet Mercury