The predawn hours of Aug. 8 present a perfect opportunity to see Jupiter's four largest moons line up next to the "King of the Planets" as it voyages through the stars of the constellation Gemini.

The ocean on Ganymede may have more water than all the water on Earth. In this artist’s concept, the moon Ganymede orbits the giant planet Jupiter. NASA’s Hubble Space Telescope observed aurorae on ...

CAPE CANAVERAL, Fla. (AP) - NASA’s Juno spacecraft has provided the first close-ups of Jupiter’s largest moon in two decades. Juno zoomed past icy Ganymede on Monday, passing within 645 miles (1,038 ...

Large pieces of dark matter hitting Jupiter’s largest moon would form distinctive craters in its icy surface, and upcoming ...

Jupiter is the king of moons. With 95 of them orbiting the gas giant, some are so large they rival planets in size. But what would it actually be like to live on one of these moons? Let’s imagine ...

When you buy through links on our articles, Future and its syndication partners may earn a commission. Io is the most volcanic world in the solar system, with around 400 volcanoes. Its extreme ...

A pair of astrophysicists with Aix- Marseille Université, CNRS, and Institut Universitaire de France have developed a new theory about the formation of Jupiter's largest moons. In their paper ...

The images were taken during the spacecraft's 66th close flyby of Jupiter on Oct. 23. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. NASA's Juno ...

Io, Europa and Ganymede had already shown their footprints through earlier observations. But Callisto, the farthest Galilean ...

Skywatchers on Thursday evening, Feb. 6, will notice an eye-catching pairing-off between two of the brightest objects in the nighttime sky. The moon, nearly two nights past first quarter and appearing ...