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Triton is the largest of the 16 known moons orbiting ____.
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1. Mercury
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The moons Ganymede and Titan are larger than the planet ____.
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2. Venus
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____ has 27 known moons and, like Neptune, a faint ring system.
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3. Earth
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____ has two small moons named Phobos and Deimos.
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4. Mars
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____ is one astronomical unit (93 million miles) from the Sun.
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5. Jupiter
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____ rotates so slowly that a day is longer than its year.
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6. Saturn
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Galileo observed the four largest moons of ____ in 1610.
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7. Uranus
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Due to its low density, ____ could theoretically float on water.
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8. Neptune
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