Saturn's core is big and fuzzy — and its gravity is written in the rings

Saturn's rings are the most magnificent and exquisitely shaped structures in the solar system. And, it turns out, they make an excellent gravitational seismograph to determine what's going on inside the planet itself.

Although not connected physically, the planet and rings are connected gravitationally.

New work analyzing images of Saturn's rings show that waves in the rings are created by changing gravity from Saturn's core as it sloshes around inside the planet like a bag of jelly, and which...