Something supercharged Uranus with radiation during Voyager flyby 40 years ago. Scientists now know what.
SMRTR summary
When Voyager 2 flew past Uranus in 1986, scientists discovered the planet's electron radiation belt was mysteriously intense—much stronger than predicted. Researchers now believe a "co-rotating interaction region," where fast solar winds overtake slower streams, temporarily supercharged the radiation belt during the flyby, similar to events observed at Earth in 2019.
SMRTR provides this summary for quick context. The original article belongs to Live Science.
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