Hubble captures rare triple-moon conjunction

February 5, 2015 8:38 PM

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Hubble captures rare triple-moon conjunction

These so-called Galilean satellites complete orbits around Jupiter with durations ranging from two to 17 days.

Firing off a string of action snapshots like a sports photographer at a NASCAR race, NASA’s 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.

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