Across
- 3. oval shape, shape of earth's orbit
- 5. a type of galaxy that has arms
- 6. planet that can float in water
- 9. planets______ around the sun
- 11. planet with longest period of revolution
- 13. name for the first four planets
- 17. sun centered model of the solar system
- 19. name of our galaxy
Down
- 1. earth centered model of the solar system
- 2. experiment that explains earth's rotation
- 4. another name for the gas giant planets
- 7. planet with the most eccentric orbit
- 8. Theory of how the universe began
- 10. red Doppler shift gives evidence that the universe is _____
- 12. planet with the largest diameter
- 14. what stage is the sun in, in its life
- 15. Earth___ on its axis
- 16. the condition of brightness
- 18. a planets path around the sun its called_____
- 20. creator of the three laws of planetary motion