You’re looking at its four Galilean Moons, by far the largest of the giant planet’s estimated 79 moons. Their collective name comes from the fact that Galileo first observed them in the year 1609.

Europa is the sixth largest satellite in our Solar System and the smallest of Jupiter’s four Galilean moons. Discovered by ...

There are four Galilean moons around Jupiter, the other being Callisto. These icy Jovian moons were first discovered by Italian astronomer Galileo Galilei in 1610. Jupiter's Folded Filamentary ...

Saturn, Jupiter’s outer neighbour, currently has 83 known satellites. The four larger moons mentioned above, also known as the 'Galilean moons', account for 99.997 percent of the total mass of Jupiter ...

Once the Sun is safely below the horizon, center your telescope on the gas giant - those in the eastern half of the U.S. will see the planet and its four Galilean moons spread out, with Io alone ...

Train your telescope on the giant world early in the evening, and you’ll see all four of its Galilean moons: Ganymede (farthest) and Io to the east, and Europa (closest) and Callisto to the west.

Saturn's moons are much smaller than Jupiter's four large moons: Ganymede (the largest satellite in the Solar System), Callisto, Io and Europa, known collectively as the 'Galilean' moons after the ...