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The presence of ____ was mathematically predicted in 1846.
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1. Mercury
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Ganymede is the largest of the 95 known moons orbiting ____.
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2. Venus
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____ is one astronomical unit (93 million miles) from the Sun.
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3. Earth
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____ rotates so slowly that a day is longer than its year.
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4. Mars
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____ has a spectacular ring system containing some of its moons.
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5. Jupiter
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____ and Neptune are about four times larger than the Earth.
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6. Saturn
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____ has the shortest orbit. A year is just 88 Earth days.
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7. Uranus
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____ has a huge dormant volcano named Olympus Mons.
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8. Neptune
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