Eleven times wider than Earth. Over 300 times more massive. And a million times more terrifying. Jupiter may look like a beautiful ball of swirling clouds, but on the inside, it is a gaseous inferno.

Jupiter is old. Like 4.5 billion years old. It started as a swirling disk of gas and dust that formed into a pretty big planetary core. With time, Jupiter’s core grew, attracting more and more rock, ...

New simulations suggest Jupiter holds far more water than once thought, reshaping ideas about how the largest planet formed.