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____ was the first planet discovered using a telescope (1781).
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1. Mercury
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____ has an atmosphere of 78% nitrogen and 21% oxygen.
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2. Venus
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____ has a huge dormant volcano named Olympus Mons.
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3. Earth
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____ is the windiest planet and has 14 known moons.
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4. Mars
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____ is the largest planet. Ganymede is its largest moon.
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5. Jupiter
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____ is the closest planet to the Sun (0.39 astronomical units).
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6. Saturn
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On ____, the Sun rises in the West and sets in the East.
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7. Uranus
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____ has a spectacular ring system. Titan is its largest moon.
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8. Neptune
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