Firing off a string of action snapshots, our Hubble Space Telescope captured the…


Firing off a string of action snapshots, our Hubble Space Telescope captured the rare occurrence of three of Jupiter’s largest moons racing across the banded face of the gas-giant planet: Europa, Callisto, and Io. These so-called Galilean moons, named after the 17th century scientist Galileo Galilei, who discovered them with a telescope, complete orbits around Jupiter with durations ranging from 2 days to 17 days. Seeing three moons transiting the face of Jupiter at the same time is rare, occurring only once or twice a decade.

Image Credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA)

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