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Compared to Earth, Venus spins very slowly on its axis.

While featureless in visible light, we can see some detail in Venus’ clouds using __________ .

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.