Jupiter’s moon Io floats above the cloudtops of Jupiter in this image captured January 1, 2001. The image is deceiving: there are 350,000 kilometers – roughly 2.5 Jupiters – between Io and Jupiter’s clouds. Io is about the size of our own moon (NASA/JPL/University of Arizona)

This image of Jupiter’s moon Europa rising above Jupiter was captured by the New Horizons spacecraft in February just after it passed Jupiter on its way to Pluto and the outer Solar System. (NASA, Johns Hopkins U. APL, SWRI)

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