Charon

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Pluto-Charon system
The Pluto-Charon system is considered a binary planet system. It's the only one in our solar system. (size is to scale distance is not).
Best yet images of Pluto's moon Charon | Science Wire | EarthSky
High-resolution images of Charon were taken by the Long Range Reconnaissance Imager on NASA’s New Horizons spacecraft. Charon’s cratered uplands at the top are broken by series of canyons, and replaced on the bottom by the rolling plains of the informally named Vulcan Planum. - Image credit: NASA/JHUAPL/SwRI