Saturn might have a fluid, sloshy core

Saturn’s core might be a slushy mixture of ice and rock, rather than a compact solid made of mostly one or the other material, as is generally thought. The diffuse core extends to approximately 60% of the planet’s radius — much bigger than the 10–20% of a planet’s radius that would be occupied by the expected core. Researchers gleaned the surprising discovery by analysing gravitational perturbations in the planet’s rings caused by the oscillating core.