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Academia Sinica Institute of Astronomy and Astrophysics

Academia Sinica Institute of Astronomy and Astrophysics

Research Institution

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Stories

Saturn's moon empire: 128 new worlds in a single day

New Capabilities

Leading planetary astronomy research

On March 11, 2025, the International Astronomical Union dropped a bombshell: 128 new moons orbiting Saturn. Not over a year. Not over a decade. All at once. A team led by Edward Ashton stacked thousands of telescope images from 2019 to 2023, revealing a swarm of tiny irregular satellites—each just a few kilometers across—that had been hiding in plain sight. Saturn now has 274 confirmed moons, more than all other planets in the solar system combined.

Updated Jan 7