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____ is one astronomical unit (93 million miles) from the Sun.
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1. Mercury
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Mercury and ____ are the only planets with no moons.
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2. Venus
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The presence of ____ was mathematically predicted in 1846.
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3. Earth
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____ has extreme temperatures (800°F day vs -330°F night).
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4. Mars
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____ has a huge dormant volcano named Olympus Mons.
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5. Jupiter
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____ has 27 known moons and, like Neptune, a faint ring system.
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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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____ has a spectacular ring system containing some of its moons.
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8. Neptune
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