Since Callisto also has an intense ionosphere, the team decided to test their methods on 30-year-old measurements taken by NASA's Galileo mission. That mission launched in 1989 and scanned Jupiter ...

ESA's Mars Express orbiter captured footage of the Mars' moon Deimos pass in front of Ganymede, Europa, Jupiter, Io and ...

Jupiter's four largest moons are some of the solar system's most compelling worlds. Io is dotted with active volcanoes , and Europa hides a subsurface ocean many want to check for alien life .

Two icy moons of Jupiter, though neighboring and of similar size, exhibit radically different internal structures. A new study suggests this dichotomy stems from their very formation, ...

Callisto, Jupiter's moon, is likely an ocean world, with evidence suggesting a subsurface ocean beneath its ice shell. Reanalysis of Galileo spacecraft data, ...

This gas giant has some really unique features that make it stand out. If you’re curious about space, learning a few things ...

Europe's JUICE probe will study three of Jupiter's icy moons, looking for ... JUICE will focus primarily on Callisto and Ganymede, making 21 flybys of the former and 12 of the latter.

Callisto, the outermost of Jupiter’s 95 moons, first caught NASA’s attention back in the 1990s when the Galileo spacecraft detected an unusual response to the planet’s shifting magnetic field.

The four — Io, Europa, Ganymede and Callisto — run a merry race with one another and orbit Jupiter so quickly (1.68 days for Io to 16.7 days for Callisto) that they change their appearance ...

Callisto just skims the northern edge of Jupiter on May 11, not long before Io begins a transit and Ganymede, hidden in the planet’s shadow, reappears to the northeast. Europa lies to the west ...

Meet Io, Europa, Ganymede and Callisto. Jupiter has dozens of moons. Four of them in particular are of interest to planetary scientists. Io, Europa, Ganymede and Callisto are, ...