1. Solar System Vocab

2. The path that an object such as a planet makes as it revolves around a second object

3. orbit

4. The movement of any object in orbit, such as the Earth moving around the sun, which takes 365 ¼ days to complete

5. revolution

6. The motion of a planet as it turns on its axis. This takes 24 hours to complete.

7. rotation

8. An imaginary line which runs through both poles of a planet

9. axis

10. An object that moves around another object in space

11. satellite

12. The different shapes the moon seems to have as it orbits around the Earth

13. phases

14. A huge burning sphere of gases

15. star

16. A group of objects in space that move around a central star

17. solar system

18. A large object that moves around a star

19. planet

20. Greek astronomer who believed in the Earth centered model. GEOCENTRIC

21. Aristotle

22. Egyptian astronomer who believed in the Earth centered model GEOCENTIC

23. Ptolemy

24. Polish astronomer who challenged the Geocentric model. He introduced the sun-centered model~ HELIOCENTRIC

25. COPERNICUS

26. Italian astronomer who believed Copernicus’ sun-centered model was correct because of improvements he made to his telescope *He was also put in jail because of his belief.

27. Galileo