Hippocamp750

artist's concept of tiny moon Hippocamp

An artist’s concept of the tiny moon Hippocamp that was discovered by the Hubble Space Telescope in 2013. Only 20 miles across, it may actually be a broken-off fragment from a much larger neighboring moon, Proteus, seen as a crescent in the background. (Image courtesy of NASA, ESA, and J. Olmsted/STScI)

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