Jupiter’s four largest and most well-studied moons were first discovered more than 400 years ago. And they still make for wonderful observational targets.

But the question of how many natural satellites the planet truly has is a bit more complicated. Jupiter's four best-known moons are the Galilean moons, discovered by Galileo Galilei in 1610.

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 ...

There are 53 named moons belonging to the planet, though scientists believe that 79 have been detected. The four largest of the moons are known as the Galilean satellites, named after Galileo ...

Astronomers recently announced that they had discovered 62 new moons around the ringed planet Saturn and more are being added to the list. So, how have they lain hidden for so long?

Discover showtimes, read reviews, watch trailers, find streaming options, and see where to watch The Galilean Satellites- Callisto (2003). Explore cast details and learn more on Moviefone.

The four largest moons, Io, Europa, Ganymede and Callisto, are called the Galilean satellites, which are named after the man who first observed them in 1610, Galileo Galilei.

Now, all 12 have officially been confirmed. Jupiter's best-known natural satellites are its four Galilean moons, named after astronomer Galileo Galilei, who observed them in 1610.

Explore Jupiter's Galilean moons—Ganymede, Callisto, Io, and Europa—their unique features, and their potential to reveal extraterrestrial life.

They're called the Galilean moons in honor of his achievement. Jupiter has 80 known satellites, but these are the only ones bright enough to see in even larger amateur telescopes.

Officially, Jupiter has 95 moons recognized by the International Astronomical Union. But the question of how many natural satellites the planet truly has is a bit more complicated.

But the question of how many natural satellites the planet truly has is a bit more complicated. Jupiter's four best-known moons are the Galilean moons, discovered by Galileo Galilei in 1610.