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Because it has a higher percentage of _________ , Neptune appears even bluer than Uranus.

The retrograde orbit of Triton dooms it to spiral inward toward Neptune, perhaps someday to make a ring system.

Of the planets, __________ is the least dense, and could float on water.

Jupiter’s axial tilt is similar to that of Mercury, while Saturn’s is more like ours.

Which planet shows the widest range of surface temperatures between day and night?

There is new evidence that water has flowed as mud on Mars in recent times.

Compared to Jupiter, the element _____________ is notably less common in Saturn’s atmosphere, perhaps condensing to fall coreward as rain.

In general, the less cratered a moon’s surface, the ________ it is.

The initial prediction by Percival Lowell of Pluto’s position was close to the place it was, in fact, found by Clyde Tombaugh in 1930.

We now know of polar caps on Mercury, the Moon, Earth, and Mars.