As the Moon reaches New, advanced observers can try photographing 3I/ATLAS while everyone can enjoy nebulae and more in the ...

Callisto’s ancient surface and low geological activity contrast sharply with Jupiter’s other moons. Using real mission images, this report outlines NASA’s discoveries about its structure, composition, ...

NASA spotted something moving in one of the moons of Jupiter. Some natural satellites have similar structures to the Earth, ...

"Eight minutes later, the orbiter started receiving data from the descent probe, which slammed into the top of the Jovian ...

ESA's Mars Express orbiter captured footage of the Mars' moon Deimos pass in front of Ganymede, Europa, Jupiter, Io and Callisto (in that order). Credit: Space.com | footage credit: ESA/DLR/FU Berlin ...

NASA’s Power to Explore Challenge asks students to create a mission to a moon using radioisotope power systems.

Suni Williams and Butch Wilmore, the astronauts who had an unexpectedly long stay in orbit, are set to head back to Earth just two days after a replacement crew docked at the space station.

NASA’s Europa Clipper and the European Space Agency’s JUICE (Jupiter Icy Moons Explorer) will collect new data about Jupiter’s moons, and China’s Tianwen-4 mission might also observe Callisto.

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 ...

A NASA spacecraft has set sail for Jupiter and its moon Europa, one of the best bets for finding life beyond Earth.

Where is Europa? Jupiter has 95 officially recognized moons, NASA says, though the actual number is probably much higher. It's four largest moons are Ganymede, Callisto, Io and Europa.