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While Saturn is almost as large as Jupiter, its mass is only about __________ of Jupiter’s.

Compared to the orbits of Venus and Earth, the orbits of both Mercury and Mars have much  _________ eccentricity.

Venus’ surface temperature cools off at night, much like Mercury’s does.

In keeping with its Roman god, Neptune probably contains a lot of water, in a slushy mantle ocean.

The Mars Rover found undisputed microfossils, proving life once existed on Mars.

Venus’ rotation on its axis

What did radar astronomers find in the polar regions of Mercury?

The Moon’s composition is similar to Earth’s ________ .

The deepest depression found on the surface of Mars is the

Mars appears red due to __________ all over its surface rocks.