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538   Directed Inquiry Explore Does distance affect orbiting time? 540   How to Read Science Make Inferences 541     You Are There! 542      Lesson 1 In what ways does Earth move? 543      Lesson 2 What are the parts of the solar system? 548      Lesson 3 What are comets and asteroids? 552      Lesson 4 What is known about the Moon? 556   Guided Inquiry Investigate Why do we see the phases of the Moon? 562      Weight on Planets 564     Chapter 17 Review and Test Prep 566    Jose Hernandez: Mission Specialist 568