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The Moon’s lower density indicates it has a smaller concentration of iron in its core, as does the absence of a lunar magnetic field.

Carbon dioxide is the predominant atmospheric gas on Venus.

Jupiter gives back into space twice the heat it gets from the Sun; the source of most of this energy is __________ .

Today most scientists favor the capture theory of the Moon’s origin, since it would explain why the Moon still orbits in the ecliptic plane, as do other planets.

The planet which shows us the widest range of surface temperatures between day and night is __________ .

The direction of the rotation of Venus is exceptional because it is in a ________ direction.

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.