Editor's note: This article was updated March 25 at 11:40 a.m. ET to account for the recent discovery of new moons around Saturn and Jupiter. The total number of planetary moons and small-body ...

New research suggests the moons of Jupiter and Uranus may hint that our planetary neighborhood once had a third ice giant.

Neptune’s third-largest moon, Nereid, could be an intact survivor from the planet’s original satellite system, upending ...

Jupiter’s Ganymede — has a unique and inexplicable magnetic field. New research could finally explain it: the moon is heating ...

Neptune has a complicated life story, and its moon Nereid might be the only one left standing from the planet’s multibillion-year history.

Ganymede may generate its magnetic field through a core that is still forming today, challenging long-held ideas about ...

How to see the Blue Micromoon 2026 ...

Neptune’s far-flung moon Nereid may be the last of the planet’s original companions that managed to survive a cosmic crash, ...

Humankind is returning to the Moon, but we won’t stop there. The international Artemis program is designed to enable exploration much farther afield. Care to float around on the Martian moons? How ...

Astronomers believe Triton may not have originally formed around Neptune.