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Volume 555 Issue 7695, 8 March 2018

This week's issue presents four papers from the Juno mission to Jupiter. Alberto Adriani and his colleagues report visible and infrared observations of Jupiter's polar regions, finding that distinct cyclones appear at both poles. The cover image, derived from Juno's JIRAM instrument, shows the central cyclone at the planet's north pole and the eight cyclones that encircle it. The colours represent radiant heat: the yellow (thinner) clouds are about −13 °C in brightness temperature, and the dark red (thickest) are around −83 °C. In a second paper, Luciano Iess and his colleagues used Doppler data to study Jupiter's gravitational field, revealing a north—south asymmetry arising from atmospheric flows. In the third paper, Yohai Kaspi and his colleagues analyse the uneven gravitational harmonics to show that atmospheric jet streams extend some 3,000 kilometres below cloud level, concluding that the mass of Jupiter's dynamical atmosphere is about 1% of Jupiter's total mass. And in the fourth paper, Tristan Guillot and his co-workers show that below the depth of 3,000 kilometres, Jupiter is rotating as a solid body. Cover image: NASA/SWRI/JPL/ASI/INAF/IAPS

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