This simulation illustrates the orbits and positions of Jupiter’s four largest moons on 24 January 2015 during a rare triple-moon transit where three of Jupiter’s largest moons were seen parading across the banded face of the gas giant planet. The three moons are Europa, Callisto, and Io.
We start with a polar view of Jupiter and its moons - including the moon Ganymede which is not seen in the transit - and tilt down to the orbital plane of the moons. The satellites move from left to right across the frame, casting shadows onto the face of Jupiter.
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NASA, ESA, and G. Bacon, L. Frattare, Z. Levay, and F. Summers (STScI/AURA)