Jupiter's four Galilean moons will line up in front of Jupiter in the early morning sky on Aug. 8. The predawn hours of Aug. 8 present a perfect opportunity to see Jupiter's four largest moons line up ...

In January 1610, Galileo Galilei, using a newly improved telescope with 20x magnification, observed four celestial bodies orbiting Jupiter, initially appearing as stars. These bodies, later named Io, ...

Of all the major planets in the solar system, Jupiter is the largest. Observers have a ring-side seat this week to view this amazing world. Jupiter reached opposition on April 7, meaning it is at the ...

Astronomers are still finding moons at Jupiter, 400 years after Galileo used his spyglass to spot the first ones. The latest discovery of a dozen small moons brings the total to 79, the most of any ...

CAPE CANAVERAL, Fla. (AP) — The solar system has a new winner in the moon department. Twenty new moons have been found around Saturn, giving the ringed planet a total of 82, scientists said Monday.

NASA’s Juno spacecraft captured a rare dark-rayed crater on Ganymede, offering fresh clues about the moon’s icy surface, ...

It's a world home to gigantic storms bigger than Australia, 100-mph winds pummeling its northern reaches and a rocky moon riddled with lava-spewing volcanoes. Welcome to Jupiter. NASA scientists have ...

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 ...

Ice moons such as Jupiter’s Europa and Saturn’s Enceladus are currently at the forefront of the search for extraterrestrial life, as it is believed that beneath their thick icy shells there are vast ...

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.