Sunbeams — what a drag. That’s the conclusion of physicists trying to solve a longstanding mystery: why the sun’s surface rotates more slowly than its inner core. The team argues that energy radiating outward from the sun pushes back slightly as it is expelled, providing just enough resistance to put on the brakes. The hypothesis is supported by a new observation: that the thin “skin” of the sun rotates more slowly than layers just beneath.
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