Radio signals from two NASA probes, Cassini at Saturn (above) and Juno at Jupiter, is allowing researchers to pierce the swirling clouds that hide the deep interiors of Jupiter and Saturn, where crushing pressure transforms matter into states unknown on Earth –“the two planets are more complex than we thought,” says Ravit Helled, a planetary scientist at the University of Zurich in Switzerland. “Giant planets are not simple balls of hydrogen and helium.”
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