Over 100 New Satellites Discovered in Our Solar System in 2025

This year, astronomers have discovered over 100 previously unknown moons in our solar system. With many more potentially awaiting discovery, cataloging these moons could enhance our understanding of planet formation.

In March, Edward Ashton and his team at Taiwan’s Academia Sinica discovered 128 new moons around Saturn, raising the planet’s total to 274. The researchers utilized hours of images taken by the Canada-France-Hawaii Telescope, stacking them to reveal dark objects previously undetectable.

Ashton’s team now holds the rights to name the newly discovered moons; however, due to the sheer number, many of Saturn’s moons lack unofficial names.

In August, a small, faint moon was identified in orbit around Uranus, increasing its total to 29. Mariam El Moutamid and researchers from the Southwest Research Institute in Colorado made this discovery using 10 long-exposure infrared images captured by NASA’s James Webb Space Telescope.

The team has not disclosed potential names for the new moon, which is currently known by its tentative designation, S/2025 U1. Eventually, it will be named after characters from Shakespeare’s plays, following the tradition established in 1787 when Earth’s first two moons, Titania and Oberon, were discovered.

Nigel Mason from the University of Kent indicates that more moons are likely to be discovered in the solar system, particularly around Neptune and Uranus, but he believes that the largest have already been mapped.

“Everyone enjoys finding a new moon and contemplating what to name it,” says Mason. “It’s an exhilarating moment—it’s a legacy.”

The ongoing cataloging and measurement of nearby satellites will help scientists learn more about their formation, allowing us to update existing models of planet formation.

“Why are there so many? What caused it? How do you create 40, 50, or 60 moons of varying shapes and sizes?” Mason notes. “That’s what makes them fascinating. It’s truly astounding, revealing that our understanding of the entire planet formation process is not as solid as we once believed.”