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Clumps following Adrastea Jupiter's moon Adrastea has an associated ring. One of the surprising discoveries from New Horizons' encounter with Jupiter was three clumps in the main rings following the tiny moon Adrastea (16 kilometers in diameter). The image shown here was taken from an animation of the clumps moving around the rings (Quicktime format, 4 MB). NASA / JHUAPL / SwRI / annotation by E. Lakdawalla