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25.5 Moons 512

Chapter summary 519

Questions 520

Problems 520

Computer problem 521

26 Minor bodies in the Solar System 523

26.1 Pluto 523

26.2 Comets 524

26.3 Meteoroids 530

26.4 Asteroids 532 Chapter summary 534 Questions 534 Problems 535 Computer problem 535

27 The origin of life 537

27.1 Origin of the Solar System 537

27.2 Chemistry on the early Earth 540

27.3 Origin of life on Earth 541

27.4 Life in the rest of the Solar System? 543

27.5 Other planetary systems? 544

27.6 Searches for extraterrestrial intelligence 547 Chapter summary 549 Questions 550 Problems 550 Computer problems 550

Appendix A Glossary of symbols 551

Appendix B Physical and astronomical constants 553

Appendix C Units and conversions 554

Appendix D Planet and satellite properties 555

Appendix E Properties of main sequence stars 558

Appendix F Astronomical coordinates and timekeeping 559

Appendix G Abundances of the elements 562

Index 565

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