So small you could walk it in 2 hours: Uranus’ new moon found

A brand-new moon has been discovered orbiting Uranus, and it’s unlike anything seen before.

First spotted by NASA’s James Webb Space Telescope in February 2025, the moon, temporarily named S/2025 U1, measures just six miles across, about the size of 90 football fields.

That makes it so small that, at a brisk pace, you could walk around its entire surface in about two hours. Despite its size, the discovery is a big step in understanding Uranus’ complex system of moons and rings.

Uranus now has 29 confirmed moons, and scientists say it has more small inner moons than any other planet in our solar system. Researchers believe the faint and tiny moon could reveal new clues about the planet’s chaotic history, its evolving rings, and its dynamic gravitational environment.

It was missed by Voyager 2 during its 1986 flyby, underscoring the power of modern instruments like the Webb telescope.

While the moon has no official name yet, tradition dictates that Uranus’ moons are named after characters from Shakespeare or Alexander Pope. For astronomers, this little world could open big scientific doors.