lecture12 - Astronomy Picture of the Day Saturn's moon...

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Astronomy Picture of the Day Saturn’s moon Prometheus, seen by Cassini
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The Terrestrial Planets
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The Terrestrial Planets Mercury 0.39 Venus 0.72 Earth 1.0 Mars 1.52 Semimajor axis of orbit (A.U.)
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The Terrestrial Planets Mercury 0.24 Venus 0.62 Earth 1.0 Mars 1.88 Orbital Period (years)
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The Terrestrial Planets Earth’s equatorial radius is 6378 km Mercury 0.38 Venus 0.95 Earth 1.0 Mars 0.53 Radius (Earth radii)
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The Terrestrial Planets Note: our Moon has a mass of about 0.012 Earth masses Mercury 0.055 Venus 0.81 Earth 1.0 Mars 0.11 Mass (Earth masses)
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The Terrestrial Planets Mercury 5.43 Venus 5.24 Earth 5.51 Mars 3.94 Mean Density (g/cm 3 )
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The Terrestrial Planets Mercury 59 Venus 243 Earth 1.0 Mars 1.03 Rotation Period (days)
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The Terrestrial Planets Mercury 0.0 Venus 177 Earth 23.5 Mars 25.2 Axis Tilt (degrees)
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The Terrestrial Planets Mercury 0 Venus 0 Earth 1 Mars 2 (both very small) Number of Moons
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key properties Close to the sun Short orbital periods
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lecture12 - Astronomy Picture of the Day Saturn's moon...

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