Voyager 2’s flyby of Uranus in 1986 recorded radiation levels so extreme they baffled scientists for nearly 40 years. New research suggests the spacecraft caught Uranus during a rare solar wind event that flooded the planet’s radiation belts with extra energy. Similar storms have been seen near Earth, where they dramatically boost radiation levels. The discovery reshapes how scientists think about Uranus—and why it deserves another visit.
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