The intensity of sunlight at the Earth?s surface is about 1000 W/m². What is the intensity of sunlight at the surface of Saturn? From Table 5.1, the distance from the Sun to the Earth is 1.50 ? 10¹¹ m, and the distance from the Sun to Saturn is 14.3 ? 10¹¹ m.

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TABLE 5.1 Solar System Data: Properties of Several Objects in the Solar System, Including the Planets and Two of the Largest Dwarf Planets (Pluto and Eris) Mean Orbital Orbital Radius Radius Period of Object (x 10°m) (x 1024 kg) Eccentricity Mass Orbital Name (x 10" m) (years) Mercury 0.579 0.240 2.44 0.330 0.21 Venus 1.08 0.615 6.05 4.87 0.007 Earth 1.50 1.00 6.37 5.98 0.017 Мars 2.28 1.88 3.39 0.644 0.093 Jupiter 7.78 11.9 71.5 1900 0.048 Saturn 14.3 29.4 60.3 568 0.054 Uranus 28.7 83.8 25.6 86.6 0.047 Neptune 45.0 164 24.8 102 0.009 Pluto 59.1 248 1.14 0.0131 0.25 Eris 100 560 2.4 0.44 Earth's Moon 3.85 x 108 m 27.3 days 1.74 0.0735 0.055 Sun 6.96 x 10 m 1.99 x 100 kg