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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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It dwarfs Mount Everest, Earth's highest peak, which rises 29,029 feet.

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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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Earth is the only planet not named for a god

Every planet except Earth was named after a Greek or Roman god or goddess.

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Mars is slowly pulling its moon Phobos in

Phobos draws about six feet closer to Mars every hundred years.

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