Why Jupiter has several giant moons but Saturn has only Titan
Researchers from Japan and China have developed a new model to explain why Jupiter and Saturn have such different moon systems. By simulating the thermal evolution and magnetic fields of the young gas giants, the team aims to understand how circumplanetary disks influence satellite formation.
Why it matters
Advances our understanding of planetary formation and the evolution of solar systems beyond our own.
Jupiter and Saturn are the two largest planets in the Solar System, and both are surrounded by enormous families of moons. Jupiter currently has more than 100 reported moons, while Saturn, which is also encircled by an extensive ring system, has more than 280.
The makeup of those moon systems is very different. Jupiter has four especially large moons, including Ganymede, the biggest moon in the Solar System. Saturn, by comparison, is dominated by Titan, the Solar System's second largest moon.
Because Jupiter and Saturn are both gas giants, astronomers have struggled to explain why their major moons developed so differently. Existing theories of satellite formation offer several possible answers, but recent research into stellar magnetic fields suggests that some of those ideas may need to be reconsidered.
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