Horizons Exploring the Universe 14th edition

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Michael Seeds and Dana Backman
Publisher: Cengage Learning

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  • Chapter 1: Here and Now
    • 1.1: Where Are We?
    • 1.2: When Is Now?
    • 1.3: Why Study Astronomy?
    • 1: Apply It (48)
    • 1: Learn It (2)

  • Chapter 2: A User's Guide to the Sky
    • 2.1: The Stars
    • 2.2: The Sky and Its Motions
    • 2: Apply It (52)
    • 2: Learn It (4)

  • Chapter 3: Cycles of the Sun and Moon
    • 3.1: Cycles of the Sun
    • 3.2: Astronomical Influences on Earth's Climate
    • 3.3: The Changeable Moon
    • 3: Apply It (71)
    • 3: Learn It (6)

  • Chapter 4: The Origin of Modern Astronomy
    • 4.1: Classical Astronomy
    • 4.2: The Copernican Revolution
    • 4.3: Planetary Motion
    • 4.4: Galileo Galilei
    • 4.5: Isaac Newton and Orbital Motion
    • 4: Apply It (127)
    • 4: Learn It (9)

  • Chapter 5: Light and Telescopes
    • 5.1: Radiation: Information From Space
    • 5.2: Telescopes
    • 5.3: Observatories on Earth: Optical and Radio
    • 5.4: Airborne and Space Observatories
    • 5.5: Astronomical Instruments and Techniques
    • 5: Apply It (70)
    • 5: Learn It (4)

  • Chapter 6: Atoms and Spectra
    • 6.1: Atoms
    • 6.2: Interactions of Light and Matter
    • 6.3: Understanding Spectra
    • 6: Apply It (67)
    • 6: Learn It (5)

  • Chapter 7: The Sun
    • 7.1: The Solar Atmosphere
    • 7.2: Solar Activity
    • 7.3: Nuclear Fusion in the Sun
    • 7: Apply It (66)
    • 7: Learn It (7)

  • Chapter 8: The Family of Stars
    • 8.1: Star Distances
    • 8.2: Apparent Brightness, Intrinsic Brightness, and Luminosity
    • 8.3: Stellar Spectra
    • 8.4: Star Sizes
    • 8.5: Star Masses—Binary Stars
    • 8.6: A Census of the Stars
    • 8: Apply It (76)
    • 8: Learn It (4)

  • Chapter 9: The Formation and Structure of Stars
    • 9.1: The Interstellar Medium
    • 9.2: Making Stars from the Interstellar Medium
    • 9.3: Young Stellar Objects and Protostellar Disks
    • 9.4: Stellar Structure and Nuclear Fusion
    • 9.5: Main-Sequence Stars
    • 9: Apply It (181)
    • 9: Learn It (16)

  • Chapter 10: The Deaths of Stars
    • 10.1: Giant Stars
    • 10.2: Lower-Main-Sequence Stars
    • 10.3: The Evolution of Binary Systems
    • 10.4: The Deaths of Massive Stars
    • 10: Apply It (65)
    • 10: Learn It (7)

  • Chapter 11: Neutron Stars and Black Holes
    • 11.1: Neutron Stars
    • 11.2: Black Holes
    • 11.3: Compact Objects With Disks and Jets
    • 11: Apply It (64)
    • 11: Learn It (5)

  • Chapter 12: The Milky Way Galaxy
    • 12.1: Discovery of the Galaxy
    • 12.2: Structure of the Galaxy
    • 12.3: Spiral Arms and Star Formation
    • 12.4: The Nucleus of the Galaxy
    • 12.5: Origin and History of the Milky Way Galaxy
    • 12: Apply It (66)
    • 12: Learn It (5)

  • Chapter 13: Galaxies: Normal and Active
    • 13.1: The Family of Galaxies
    • 13.2: Measuring the Properties of Galaxies
    • 13.3: The Evolution of Galaxies
    • 13.4: Active Galactic Nuclei and Quasars
    • 13.5: Disks, Jets, Eruptions, and Galaxy Evolution
    • 13: Apply It (113)
    • 13: Learn It (6)

  • Chapter 14: Modern Cosmology
    • 14.1: Introduction to the Universe
    • 14.2: The Big Bang Theory
    • 14.3: Space and Time, Matter and Gravity
    • 14.4: Twenty-First-Century Cosmology
    • 14: Apply It (62)
    • 14: Learn It (5)

  • Chapter 15: Origin of the Solar System and Extrasolar Planets
    • 15.1: The Great Chain of Origins
    • 15.2: A Survey of the Solar System
    • 15.3: The Story of Planet Building
    • 15.4: Planets Orbiting Other Stars
    • 15: Apply It (67)
    • 15: Learn It (4)

  • Chapter 16: Earth and Moon: Bases for Comparative Planetology
    • 16.1: A Travel Guide to the Terrestrial Planets
    • 16.2: Planet Earth
    • 16.3: The Moon
    • 16: Apply It (90)
    • 16: Learn It (10)

  • Chapter 17: Mercury, Venus, and Mars
    • 17.1: Mercury
    • 17.2: Venus
    • 17.3: Mars
    • 17: Apply It (70)
    • 17: Learn It (4)

  • Chapter 18: The Outer Solar System
    • 18.1: A Travel Guide to the Outer Solar System
    • 18.2: Jupiter
    • 18.3: Saturn
    • 18.4: Uranus
    • 18.5: Neptune
    • 18.6: Pluto and the Kuiper Belt
    • 18: Apply It (113)
    • 18: Learn It (9)

  • Chapter 19: Meteorites, Asteroids, and Comets
    • 19.1: Meteoroids, Meteors, and Meteorites
    • 19.2: Asteroids
    • 19.3: Comets
    • 19.4: Asteroid and Comet Impacts
    • 19: Apply It (51)
    • 19: Learn It (6)

  • Chapter 20: Astrobiology: Life on Other Worlds
    • 20.1: The Nature of Life
    • 20.2: Life in the Universe
    • 20.3: Intelligent Life in the Universe
    • 20: Apply It (62)
    • 20: Learn It (5)

  • Chapter VAL: Virtual Astronomy Labs
    • Lab 1: Measurement and Unit Conversion (3)
    • Lab 2: Light and Matter (4)
    • Lab 3: The Doppler Effect (2)
    • Lab 4: The Solar Wind and Cosmic Rays (3)
    • Lab 5: Planetary Geology (3)
    • Lab 6: Tides and Tidal Forces (2)
    • Lab 7: Planetary Atmospheres (2)
    • Lab 8: Extrasolar Planets (3)
    • Lab 9: Kepler's Laws (3)
    • Lab 10: Helioseismology (2)
    • Lab 11: Stars, Star Clusters, and the HR Diagram (2)
    • Lab 12: Binary Stars (3)
    • Lab 13: White Dwarfs and Stellar Explosions (3)
    • Lab 14: Neutron Stars and Pulsars
    • Lab 15: Asteroids and Kuiper Belt Objects
    • Lab 16: Astronomical Distance Scales
    • Lab 17: Evidence for Dark Matter
    • Lab 18: The Hubble Law (3)
    • Lab 19: The Fate of the Universe (1)


Now enhanced with WebAssign, the fourteenth edition of Horizons: Exploring the Universe is fully updated with the latest astronomy discoveries and online resources to meet the needs of today's students. Its unique and compelling stars-first organization allows students to see that the planets of our solar system are a natural byproduct of star formation. Focusing on two central questions—"What Are We?" and "How Do We Know?"—Seeds and Backman help students understand their place in the universe and how scientists work.

Most questions from this textbook are available in WebAssign. The online questions are identical to the textbook questions; however, randomized parameters have been added so that each student receives a unique version of the question.

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  • Virtual Astronomy Laboratories (VALs) can be assigned as a standalone activity or as part of a larger learning experience. VAL incorporates real astronomical data, simulations, and other interactive elements, offering students the opportunity to experience astronomy as a scientist. Targeted feedback guides students in revising any incorrect answers.
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Questions Available within WebAssign

Most questions from this textbook are available in WebAssign. The online questions are identical to the textbook questions except for minor wording changes necessary for Web use. Whenever possible, variables, numbers, or words have been randomized so that each student receives a unique version of the question. This list is updated nightly.

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BLACK questions are available now
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Group Quantity Questions
Chapter VAL: Virtual Astronomy Labs
VAL.1 3 001 002 003
VAL.2 4 001 002 003 004
VAL.3 2 001 002
VAL.4 3 001 002 003
VAL.5 3 001 002 003
VAL.6 2 001 002
VAL.7 2 001 002
VAL.8 3 001 002 003
VAL.9 3 001 002 003
VAL.10 2 001 002
VAL.11 2 001 002
VAL.12 3 001 002 003
VAL.13 3 001 002 003
VAL.18 3 001 002 003
VAL.19 1 001
Chapter 1: Here and Now
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Chapter 2: A User's Guide to the Sky
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Chapter 3: Cycles of the Sun and Moon
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Chapter 4: The Origin of Modern Astronomy
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Chapter 5: Light and Telescopes
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Chapter 6: Atoms and Spectra
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Chapter 7: The Sun
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Chapter 8: The Family of Stars
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Chapter 9: The Formation and Structure of Stars
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Chapter 10: The Deaths of Stars
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Chapter 11: Neutron Stars and Black Holes
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Chapter 12: The Milky Way Galaxy
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Chapter 13: Galaxies: Normal and Active
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Chapter 14: Modern Cosmology
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Chapter 15: Origin of the Solar System and Extrasolar Planets
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Chapter 16: Earth and Moon: Bases for Comparative Planetology
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Chapter 17: Mercury, Venus, and Mars
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17.LI 4 QL.001 QL.002 Tut.001 Tut.002
Chapter 18: The Outer Solar System
18.AI 113 OP.001 OP.002 OP.003 OP.004 OP.005 OP.006 OP.007 OP.008 OP.009 OP.010 OP.011 OP.012 OP.013 OP.014 OP.015 OP.016 Ord.001 Ord.002 Ord.003 Ord.004 P.001 P.002 P.003 P.004 P.005 P.006 P.007 P.008 P.009 P.010 P.011 P.012 P.013 P.014 P.015 P.016 P.017 P.018 P.019 P.020 P.021 P.022 P.023 P.024 P.025 P.026 P.027 P.028 P.029 P.030 P.031 P.032 P.033 P.034 P.035 P.036 P.037 P.038 P.039 P.040 P.041 P.042 P.043 P.044 P.045 P.046 P.047 P.048 P.049 P.050 P.051 P.052 P.053 P.054 P.055 P.056 P.057 P.058 P.059 P.060 P.061 P.062 P.063 P.064 P.065 P.066 P.067 P.068 P.069 P.070 P.071 P.072 P.073 P.074 P.075 P.076 P.077 P.078 P.079 P.080 P.081 P.082 P.083 P.084 P.085 P.086 P.087 P.088 P.089 P.090 P.091 P.092 P.093
18.LI 9 QL.001 QL.002 QL.003 Tut.001 Tut.002 Tut.003 Tut.004 Tut.005 Tut.006
Chapter 19: Meteorites, Asteroids, and Comets
19.AI 51 OP.001 OP.002 OP.003 OP.004 OP.005 OP.006 OP.007 OP.008 Ord.001 Ord.002 P.001 P.002 P.003 P.004 P.005 P.006 P.007 P.008 P.009 P.010 P.011 P.012 P.013 P.014 P.015 P.016 P.017 P.018 P.019 P.020 P.021 P.022 P.023 P.024 P.025 P.026 P.027 P.028 P.029 P.030 P.031 P.032 P.033 P.034 P.035 P.036 P.037 P.038 P.039 P.040 P.041
19.LI 6 QL.001 QL.002 Tut.001 Tut.002 Tut.003 Tut.004
Chapter 20: Astrobiology: Life on Other Worlds
20.AI 62 OP.001 OP.002 OP.003 OP.004 OP.005 OP.006 OP.007 OP.008 Ord.001 Ord.002 P.001 P.002 P.003 P.004 P.005 P.006 P.007 P.008 P.009 P.010 P.011 P.012 P.013 P.014 P.015 P.016 P.017 P.018 P.019 P.020 P.021 P.022 P.023 P.024 P.025 P.026 P.027 P.028 P.029 P.030 P.031 P.032 P.033 P.034 P.035 P.036 P.037 P.038 P.039 P.040 P.041 P.042 P.043 P.044 P.045 P.046 P.047 P.048 P.049 P.050 P.051 P.052
20.LI 5 QL.001 Tut.001 Tut.002 Tut.003 Tut.004
Total 1743