lecture16 - Astronomy Picture of the Day Close-up of the...

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Astronomy Picture of the Day Close-up of the Sun’s surface, from the National Solar Observatory
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The Giant (Jovian) Planets
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The giant planets, and Pluto Jupiter 5.2 Saturn 9.5 Uranus 19.2 Neptune 30.0 Pluto 39.5 Semimajor Axis of Orbit (A.U.)
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The giant planets, and Pluto Jupiter 11.86 Saturn 29.42 Uranus 83.75 Neptune 163.72 Pluto 248.02 Orbital Period (years)
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The giant planets, and Pluto Jupiter 11.2 Saturn 9.4 Uranus 4.0 Neptune 3.9 Pluto 0.2 Equatorial Radius (earth radii)
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Relative sizes of the giant planets
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The giant planets, and Pluto Jupiter 317.9 Saturn 95.2 Uranus 14.5 Neptune 17.2 Pluto 0.0025 Mass (earth masses)
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The giant planets, and Pluto Jupiter 1.33 Saturn 0.70 Uranus 1.30 Neptune 1.76 Pluto 2.1 Mean density (g/cm 3 )
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The giant planets, and Pluto Jupiter 0.41 Saturn 0.45 Uranus 0.72 Neptune 0.67 Pluto 6.4 Rotation Period (days)
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Rapid rotation and the shapes of Jupiter and Saturn
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The giant planets, and Pluto Jupiter 3.12 Saturn 26.73 Uranus 97.86 Neptune 29.56 Pluto 120 Axis Tilt (degrees)
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The giant planets, and Pluto Jupiter 63 Yes Saturn 60 Yes Uranus 27 Yes Neptune 13 Yes Pluto 3 No Number of Rings? Moons Known
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The giant planets: key properties Far from the sun Long orbital periods Much larger and more massive than the Earth Relatively low densities Fast rotators All have rings and many moons Pluto’s size and composition are very different from the giant planets!
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Exploration of the giant planets Pioneer 10 (Jupiter), launched 1972 Pioneer 11 (Jupiter, Saturn), launched 1973 Voyager 1 & 2 (Jupiter, Saturn, Uranus, Neptune), launched 1977 Galileo (Jupiter), launched 1989 Cassini/Huygens (Jupiter, Saturn), launched 1997, still orbiting around Saturn New Horizons: launched 2006, heading toward Pluto
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Internal structure
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lecture16 - Astronomy Picture of the Day Close-up of the...

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