Jupiter was already the king of the solar system, and new discoveries give the massive planet another way to reign supreme: It now has the most moons.
Twelve new moons discovered orbiting Jupiter have been confirmed, bumping the count from 80 to 92, and knocking Saturn — which has 83 moons — down a peg.
The newly discovered moons are small, ranging from 0.6 to 2 miles (1 to 3.2 kilometers) wide, and most of them have wide orbits. Nine of the 12 moons take more than 550 days to orbit the gas giant, Sky and Telescope reported. These far-out moons also orbit Jupiter in a retrograde motion, meaning they move in the opposite direction of Jupiter's rotation. Their distant and retrograde orbits likely mean these objects used to be asteroids and eventually got caught up in Jupiter's gravity, according to the researcher who detected them.
The moons were discovered in 2021 and 2022 by Scott Sheppard, an astronomer at the Carnegie Institution for Science in Washington, D.C. He reported his findings to the International Astronomical Union's Minor Planet Center, which tracks all reports of small bodies in the solar system. Before the moons could be officially confirmed, their complete orbits had to be tracked, according to Sky and Telescope. Now, all 12 have officially been confirmed.
