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The nature and structure of the observed east-west flows on Jupiter andSaturn has been one of the longest-lasting mysteries in planetary science. Thismystery has been recently unraveled due to the accurate gravity measurementsprovided by the Juno mission to Jupiter and the Grand Finale of the Cassinimission to Saturn. These two experiments, which coincidentally happened aroundthe same time, allowed determination of the vertical and meridional profiles ofthe zonal flows on both planets. This paper reviews the topic of zonal jets onthe gas giants in light of the new data from these two experiments. The gravitymeasurements not only allow the depth of the jets to be constrained, yieldingthe inference that the jets extend roughly 3000 and 9000 km below the observedclouds on Jupiter and Saturn, respectively, but also provide insights into themechanisms controlling these zonal flows. Specifically, for both planets thisdepth corresponds to the depth where electrical conductivity is within an orderof magnitude of 1 S/m, implying that the magnetic field likely plays a key rolein damping the zonal flows.

Comparison of the deep atmospheric dynamics of Jupiter and Saturn in light of the Juno and Cassini gravity measurements