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The lunar mare radioactively date back to 4.6 billion years, at the origin of the Moon, hence their dark color due to this aging.

The Sun’s tidal pull has slowed Mercury’s rotation down to __________ that of its year.

Which of these gases is the least abundant in our atmosphere?

Greenhouse gases in our atmosphere trap just enough heat to keep the earth’s oceans liquid.

Mars appears red in color because of refraction of light by its atmosphere, much like the color of the totally eclipsed Moon.

The _________ in our atmosphere is the result of photosynthesis by plants.

One characteristic of the terrestrial planets is their extensive moon systems.

In general, the ___________ lunar craters sit atop the mare.

While __________ gas is the main atmospheric component of both Mars and Venus, its density means it plays a far larger role in heating Venus.

Before it arrived in orbit about Eros, the NEAR spacecraft visited