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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.

At which planet can the pole remain in darkness for 42 years, then have 42 years of constant daylight?

All four Jovian magnetic fields are good examples of the dynamo theory, with the magnetic fields aligned well with the planets’ rapid rotations.

Uranus has a larger fraction of methane in its atmosphere than Neptune.

Which planet had the Great Dark Spot in 1989, but had lost it by 1995?

In brightness, Jupiter is second only to the planet __________ most of the time.

All nine planets in the solar system have been visited by spacecraft.