1. { Chapter 2 The Solar System 1

2. { Lesson 1 The Structure of the Solar System 2

3. 3

4. Objects in the Solar System (cont.) 4

5. 5

6. The Motion of the Planets 6

7. { Lesson 2 The Inner Planets 7

8. Planets Made of Rock 8

9. Mercury 9

10. Venus (cont.) 10

11. Earth 11

12. Mars 12

13. { Lesson 3 The Outer Planets 13

14. The Gas Giants 14

15. 15

16. 16

17. 17

18. 18

19. 19

20. { Lesson 4 Dwarf Planets and Other Objects 20

21. Dwarf Planets 21

22. Pluto: Dr. R. Albrecht, ESA/ESO Space Telescope European Coordinating Facility; NASA Ceres: NASA, ESA, and J. Parker (Southwest Research Institute) Eris: NASA, ESA, and M. Brown (California Institute of Technology) 22

23. Asteroid: NASA/JPL/JHUAPL Ida: NASA/JPL/USGS Vesta: Ben Zellner (Georgia Southern University), Peter Thomas (Cornell University), NASA/ESA Eros: NASA/Goddard Space Flight Center Scientific Visualization Studio 23

24. Comet: Roger Ressmeyer/Getty Images Wild 2: NASA/JPL-Caltech 24