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The James Webb Space Telescope has resolved a long-standing puzzle about Saturn's apparently variable rotation rate. Scientists discovered that the planet's rotation speed was never actually changing; instead, powerful high-altitude winds in Saturn's atmosphere created the illusion of variation. Webb observations revealed that Saturn's northern lights heat the atmosphere, generating winds that produce electrical currents, which in turn sustain the auroras in a continuous feedback loop.
Why it matters
This discovery corrects decades of misunderstanding about gas giant planets and their atmospheric dynamics. The findings improve our understanding of how auroras interact with planetary atmospheres and could help refine measurements of rotation rates for other gas giants in our solar system and beyond.
A decades-old mystery about Saturn has finally been solved thanks to the James Webb Space Telescope. Scientists discovered that Saturn’s changing “rotation rate” was never caused by the planet speeding up or slowing down, but by powerful winds high in its atmosphere. Webb’s unprecedented observations revealed that Saturn’s northern lights actively heat the atmosphere, creating winds that generate electrical currents, which then power the aurora all over again in a self-sustaining cycle.
Source: Astronomers finally solve Saturn’s decades-long spin mystery