Jupiter is the king of moons. With 95 of them orbiting the gas giant, some are so large they rival planets in size. But what ...

The hellish surface of a moon of Jupiter known as Io is riddled with hundreds of lava-spewing volcanoes that make the world one of chaos and violence. The brutal conditions also make Io intriguing to ...

The crescent moon will shine with Jupiter among the stars of Gemini early on Sept. 16. Turn your eyes to the east in the ...

The predawn hours of Aug. 8 present a perfect opportunity to see Jupiter's four largest moons line up next to the "King of the Planets" as it voyages through the stars of the constellation Gemini.

NASA's Juno spacecraft has spied the final "auroral footprint" of a moon of Jupiter, meaning that it has watched as the moon ...

Earth is the only planet in our solar system with a single moon, making it a rare phenomenon for a planet of its kind.

Plus, catch Saturn and Neptune at their brightest; spy the "string of pearls" galaxy; and a close encounter of the moon and ...

Stargazers in the U.S. will witness the razor-thin waning crescent moon rise close to Venus and the bright star Regulus in ...

NASA’s Juno spacecraft has successfully found and characterised the auroral “footprints” of Jupiter’s moon Callisto for the first time. This discovery completes ...

On this date, Jan. 7, 1610, astronomer Galileo Galilei, with a homemade telescope, noticed three points of light near Jupiter. Initially believing they were distant stars, Galileo’s repeated ...

This is a day-old moon from Feb. 19, 2015 low in the western sky shortly after sunset. Notice that the entire outline of the moon is faintly visible. This is caused by sunlight reflecting off the ...