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All asteroids together weigh less than the Moon

The total mass of all the asteroids combined is less than that of Earth's Moon.

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Most orbit the Sun between Mars and Jupiter in the main asteroid belt. They range from Vesta, about 329 miles across, down to rocks less than 33 feet wide.

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Jupiter has the shortest day of any planet

Jupiter spins once in about 9.9 hours, the shortest day in the solar system.

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Mars has the largest volcano in the solar system

Olympus Mons on Mars is the largest volcano in the solar system, with a base as large as the state of Arizona.

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Mercury is the fastest planet

Mercury zips around the Sun every 88 Earth days, faster than any other planet.

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