Table of Contents

1 Front Matter; 2 Executive Summary; 3 Summary; 4 1 Introduction to Planetary Science; 5 2 National and International Programs in Planetary Science; 6 3 Priority Questions in Planetary Science for the Next Decade; 7 4 The Primitive Bodies: Building Blocks of the Solar System; 8 5 The Inner Planets: The Key to Understanding Earth-Like Worlds; 9 6 Mars: Evolution of an Earth-Like World; 10 7 The Giant Planets: Local Laboratories and Ground Truth for Planets Beyond; 11 8 Satellites: Active Worlds and Extreme Environments; 12 9 Recommended Flight Investigations: 2013-2022; 13 10 Planetary Science Research and Infrastructure; 14 11 The Role of Technology Development in Planetary Exploration; 15 12 A Look to the Future; 16 Appendixes; 17 Appendix A: Letter of Request and Statement of Task; 18 Appendix B: List of Planetary Science Community White Papers Contributed; 19 Appendix C: Cost and Technical Evaluation of Priority Missions; 20 Appendix D: Other Missions Considered; 21 Appendix E: Decadal Planning Wedge for NASA's Planetary Science Division; 22 Appendix F: Glossary, Abbreviations, and Acronyms; 23 Appendix G: Mission and Technology Study Reports