On January 7, 1610, Italian astronomer Galileo Galilei spotted three points of light that he later confirmed to be Jupiter’s moons. A.S.Ganesh takes a look at a discovery that led to the ...

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.

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

Monday: The Galilean moons are a good target with binoculars or a telescope. Typically you can see two or three moons depending on their positions and the change in position can easily be observed ...

With 30 satellites now in orbit, Galileo is expanding its constellation, increasing the reliability, robustness and, ultimately, the precision, benefiting billions of users worldwide.

On April 27, 2024 the SpaceX Falcon 9 medium-lift launch vehicle launched into orbit Galileo satellites GM25 and FM27 from Kennedy Space Center in Florida. This was Falcon 9’s 20th and final launch.

The differential compositions of the four Galilean moons has puzzled researchers for decades—ever since the first high-quality density measurements of the satellites were obtained.

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.

Update 14 April 2023 Jupiter mission will be first to orbit moon of another planet Europe’s JUICE spacecraft will study three of Jupiter’s four Galilean moons: Ganymede, Callisto and Europa.

Years of patient research revealed that auroras can be seen on the Galilean moons of Jupiter: hypervolcanic Io, icy Europa, quirky Callisto and gigantic Ganymede.