This time-lapse video shows two of Jupiter’s moons, Europa and Io, crossing in front of the planet’s Great Red Spot, the largest known storm system in our Solar System. The video was assembled from images taken by the Cassini spacecraft as it passed Jupiter in 2000 on its way to Saturn. Europa appears to overtake Io, which shouldn’t happen from a fixed point of view because Io is closer to Jupiter and moves faster. However, the Cassini spacecraft wasn’t standing still, so the camera location changes significantly during the video.

Video Credit: NASA / ESA / JPL / Cassini Imaging Team / SSI
Processing: Kevin M. Gill