Watch three of Jupiter’s moons become visible at once in ultra-rare event [VIDEO]

January 26, 2015 6:43 PM

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For about 25 minutes, astronomers were able to see three of the four Galilean moons — Io, Europa, and Callisto — at once as they crossed Jupiter’s surface.

Jupiter’s moons gave astronomers quite a show recently, as three of them all cast their shadows on the planet’s surface at the same time in a rare event.

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