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THE NORTHERN STORM
This false-colour image from Cassini shows the vast storm at Saturn’s north pole, which gathers within the yellow-green, hexagonally shaped jet stream. The storm within the hexagonal ring is 20,000 miles (32,000 kilometres) across, or over twice the diameter of Earth. The eye of the storm, which appears dark red, is 1,250 miles (2,010 kilometres) across and contains speeds up to 330 miles (531 kilometres) per second. Outside the eye, lower clouds are depicted in orange, while a smaller pale-blue vortex (at the bottom, centre-right) indicates a smaller storm within the overall storm. In fact, there are many smaller vortices spinning within the enormous storm; the largest of these spans 2,200 miles (3,540 kilometres), twice the size of the largest hurricane ever recorded on Earth. In this image, the north pole region is framed by Saturn’s rings, which appear vibrant blue.
Image credit: NASA, JPL-Caltech, SSI
The Planets: Photographs from the Archives of NASA text by Nirmala Nataraj, photographs by NASA, preface by Bill Nye (Chronicle Books, £30)

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