Turn a telescope to the eastern sky in the hours following midnight on Nov. 5 to see two colossal shadows darken the cloud ...

Even in a backyard telescope, the four largest moons of Jupiter are big enough to be seen as little specks of light. And while humans have known about these “Galilean satellites” for centuries, there ...

November's Sky Above episode features a supermoon, meteor shower, and interstellar comet, with experts discussing these ...

In a landmark observation by a team of international researchers, NASA's Juno spacecraft has, for the first time, clearly detected the auroras of Jupiter's moon Callisto. This discovery completes the ...

Webb just spotted a carbon-rich moon factory 625 light-years away, revealing how moons like ours may have first taken shape.

Astronomers continue to make new discoveries about the Galilean moons of Jupiter, a thrilling environment of ice and fire. In a pair of studies published this month, the James Webb Space Telescope ...

Most of us know four moons of Jupiter, called the Galilean moons because they were first discovered by Galileo in 1610. Named for figures closely associated with Jupiter from Greek mythology, Io, ...

NASA’s James Webb Space Telescope (JWST) has captured an extraordinary and unprecedented sight: a moon-forming disk surrounding a young, giant exoplanet located roughly 625 light years ...

On Jan. 7, 1610, Galileo discovered four moons revolving around Jupiter — a discovery that would change his life forever. These four moons are Jupiter’s largest satellites — lo, Europa, Ganymede and ...