Saturn may be famous for its rings, but it has long fascinated scientists for another reason: its restless atmosphere, which is shaped by fierce winds, stubborn megastorms and strange weather patterns that can linger for years.
Now, two new views from the James Webb and Hubble space telescopes are cutting through the ringed planet's clouds, giving researchers what NASA calls the "most comprehensive view of Saturn to date." Together, the images let researchers "slice" through Saturn's atmosphere at different heights.
The paired observations capture one of Saturn's strangest landmarks: the famous hexagon at the north pole. According to NASA, the faint edges of the six-sided jet stream appear in both images. These pictures could be some of the last high-resolution views of the hexagon until the 2040s, as Saturn's north pole is about to tip into 15 years of winter darkness.
Studying Saturn's atmosphere not only allows scientists to understand how large, planet-size storms grow and thrive but also gives further insight into how the planet formed and evolved over billions of years.
A planet seen two ways
In August 2024, Hubble took its visible-light image of Saturn as part of the Outer Planet Atmospheres Legacy program, a decade-long project that tracks the outer planets annually. The James Webb Space Telescope (JWST) captured its infrared image a few months later, in November 2024. Those observations, taken 14 weeks apart, showed the ringed planet shifting from northern summer toward its 2025 equinox.
The two telescopes saw very different Saturns.
While Hubble captured Saturn's pale-yellow bands and brilliant-white rings, JWST's infrared image revealed even more striking details. In the infrared view, Saturn's rings transformed into glowing blue "because they are made of highly reflective water ice," NASA representatives said in a statement. Saturn's poles also shone a strange gray-green, emitting light at wavelengths of about 4.3 microns. These emissions could be from either light scattering off of high-altitude aerosols or auroras, NASA suggested. (The telescope recently caught giant auroras shining on Uranus.)
As Saturn tilts into its southern springtime, both space telescopes will continue to keep their eyes on its atmosphere, perhaps revealing more about the planet's weather dynamics. Until then, Saturn is keeping some of its most interesting secrets hidden in the clouds.
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