Mars has two moons: Phobos and Deimos. They’re unusual, compared to other planet’s satellites, because they’re so tiny and orbit so close to the planet. The larger of the two, Phobos, is shaped something like a potato and has a diameter of anything from 20 km to 28 km, depending on how you measure it. It orbits at an altitude of only 9,270 km (compared to Earth’s moon, at over 350,000 km!). Although Deimos orbits at a more reasonable distance of 23,460 km, it is by far the smaller of the two with a diameter of only 8 km. For perspective, a healthy adult walking at a brisk pace could circumnavigate it in an hour!
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