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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.

Valles Marineris is the most striking example of a(n)

Jupiter puts back into space twice the energy it gets from the Sun.

If you could find a bathtub big enough for Saturn, the planet would

Methane gas absorbs the color _______ , accounting for the colors of Uranus and Neptune.

The surface of Io looks most like the pack ice of the Artic Ocean of Earth.