Sky This Week is brought to you in part by Celestron. Friday, May 9Asteroid 9 Metis reaches at opposition at 2 A.M. EDT in ...

also known as the Galilean moons. These pictures and the data they gathered offered the first hints that a global ocean may be beneath Europa's icy crust. Moreover, planetary models indicated that ...

The goal is to reach Europa, the smallest of the planet's four Galilean moons, in April 2030, as part of the first mission specifically designed to study the under 2,000-mile-across space rock.

The gravitational fields of the outer Galilean moons, Ganymede and Callisto, also contribute to the flexing. We already knew that the surface of Europa is covered with water ice. That this water ...

In October 2024, NASA launched Europa Clipper, which will determine the thickness of this outer icy layer and characterize the Galilean moon's overall geology. All of these great observatories ...

On the fiery Io, the innermost and third-largest of Jupiter’s four Galilean moons, Juno's observations have provided more insights about its incessant volcanic activity. It's a world home to ...