SUNSET: 
Meet Callisto, Jupiter's Ancient Moon
Meet Callisto, the heavily cratered moon that's the most distant of the Galilean satellites from Jupiter.
How Jupiter’s Moon Ganymede Melted Its Core
A new model explains how Ganymede got its molten core — which in turn has given Jupiter's largest moon its magnetic field.
NASA's Juno Mission Makes Closest Flyby Past Io
Juno has revealed Jupiter's volcanic moon Io as never before.
Striking New Views of Jupiter and Its Moon Io
The James Webb Space Telescope and Juno mission turned their eyes to Jupiter and its volcanic moon Io, revealing fine details.
New Photos from NASA's Perseverance and Juno
NASA spacecraft are constantly sending back images from across the solar system. Here are two that caught our eye.
Astronomers Find a Dozen More Moons for Jupiter
The discovery of a dozen new moons for Jupiter makes the king of planets the king of moons, too — at least for now.
Moons of the Solar System
Not so long ago, astronomers thought only a few dozen moons orbited the planets of our solar system. Today, the total count tops 400!
Amateur Astronomer Discovers New Moon of Jupiter
An amateur astronomer has discovered a new moon of Jupiter. While it hasn't received official designation yet, it would bring the tally of Jovian satellites to 80.
Amateur Astronomer Finds “Lost” Moons of Jupiter
An amateur astronomer has recovered four of five "lost" Jovian moons.
Jupiter's Moons: 10 More Found, 79 Known
Over the past 18 months, astronomers have painstakingly tracked a dozen tiny moons that they found circling the giant planet Jupiter.
Why Are the Galilean Moons So Massive?
Scientists propose that Saturn’s meddling helped create the four giant Galilean moons orbiting Jupiter.
Two New Satellites for Jupiter
Just a mile across, a pair of moonlets found orbiting Jupiter bring the planet's total satellite count to 69.
