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Titan is the largest of the 146 known moons orbiting ____.
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1. Mercury
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____ was the first planet discovered using a telescope (1781).
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2. Venus
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____ has two small moons named Phobos and Deimos.
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3. Earth
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The moons Ganymede and Titan are larger than the planet ____.
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4. Mars
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____ has an atmosphere of 78% nitrogen and 21% oxygen.
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5. Jupiter
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____, the windiest planet, is 30 astronomical units from the Sun.
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6. Saturn
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Mercury and ____ are the only planets with no moons.
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7. Uranus
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____ (the largest planet) and Saturn are gas giants.
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8. Neptune
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