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____ (the largest planet) and Saturn are gas giants.
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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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Titan is the largest of the 146 known moons orbiting ____.
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3. Earth
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____ was the first planet discovered using a telescope (1781).
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4. Mars
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Due to iron oxide (rust) on its surface, ____ appears red.
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5. Jupiter
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Uranus and ____ appear blue due to methane in their atmospheres.
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6. Saturn
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About 71% of ____ is covered by water.
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7. Uranus
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____ has almost no atmosphere. Mars has a very thin one.
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8. Neptune
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