More pocked with craters than any other object in our solar system, Jupiter's outermost and second-biggest Galilean moon, Callisto, appears geologically unremarkable. In the 1990s, however, NASA's ...

The hellish surface of a moon of Jupiter known as Io is riddled with hundreds of lava-spewing volcanoes that make the world ...

Scientists are studying Saturn's moon Titan to assess its tidal dissipation rate, the energy lost as it orbits the ringed planet with its massive gravitational force. Understanding tidal dissipation ...

The volcanic moon, which orbits the gas giant Jupiter, has long been written off as a possible home for alien life, as its extreme temperature and lava-covered surface make it wholly inhabitable.

To get somewhere in outer space, you can’t exactly drive in a straight line. Orbits are tricky things, and sending a probe to ...

When you buy through links on our articles, Future and its syndication partners may earn a commission. An image shows Io and the Juno spacecraft with a top down view of its south pole and the ...