On July 6, 1938, an American astronomer named Seth Barnes Nicholson discovered Jupiter's moon Lysithea. Nicholson spotted ...

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

On the fiery Io, the innermost and third-largest of Jupiter’s four Galilean moons, Juno's observations have provided more insights about its incessant volcanic activity.

The crescent moon will appear "wafer thin" through the night of April 29 as it draws near to the large planet and will make its closest visual approach to Jupiter for the year as it passes over ...

This series of four images was taken on January 28, 2012 during an evening of public observing. While visitors were observing features on Jupiter with the observatory's main 16" telescope, and using ...

Each of Jupiter's other 91 official moons has a diameter greater than 0.6 mile (1 kilometer) — but only 57 have names, and just eight have regular, nearly round orbits.

Each of Jupiter's other 91 official moons has a diameter greater than 0.6 mile (1 kilometer) — but only 57 have names, and just eight have regular, nearly round orbits.

Europa Clipper will face a challenge once it reaches the planet's moon — exposure to radiation, since the moon is within Jupiter’s magnetic field. To combat this, the spacecraft's electronics ...

A massive NASA spacecraft is ready to set sail for Jupiter and its moon Europa. The craft, named Europa Clipper, will determine if conditions there could support life.

The moon holds the third closest orbit of all of Jupiter’s known moons (of which 95 are known), and takes about half an Earth day to circle around the giant planet. It’s tiny but certainly mighty.

The moon and Jupiter will meet Wednesday night in the constellation Aries. Look west just after sunset, which is around 8 p.m. By that time, the duo will be going down after passing the highest ...

At Saturday’s sunset, the Full Hunter’s moon will rise in the east, accompanied by bright Jupiter to its lower left. As described by NASA: “The next full moon will be on Saturday afternoon ...