Jupiter’s elusive 5th moon caught crossing the Great Red Spot in new NASA images

Close-up of a gas giant is striped with tans, browns, and some faint orange. A white arrow points to a small dark dot, the shadow of a moon.

NASA’s Juno spacecraft has spotted Jupiter’s elusive fifth moon as it passed through the giant planet’s Great Red Spot, giving astronomers a rare view of this small but intriguing natural satellite.

Jupiter’s most famous moons are the four Galilean satellites: Io, Europa, Ganymede and Callisto, each of which is several thousand kilometers wide. Jupiter’s fifth moon to be discovered, and the fifth largest of the planet’s 95 known moons, is Amalthea. It was found in 1892 by Edward Emerson Barnard, an American astronomer who was an excellent visual observer. He also discovered Barnard’s Star, as well as a large number of dark nebulae.

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