If there was a contest for the most interesting moon in our solar system, Callisto would be a contender. Jupiter's ...

The flowing water likely wraps around a solid rocky core. If true, that would make Callisto a close sibling to Europa, another moon of Jupiter ... 150 miles beneath the surface.

After identifying an unusual trend in the movement of the hot Jupiter planet ... number of Earth-sized rocky exoplanets, some ...

NASA's $5 billion Europa Clipper had a rocky road to space. How it switched rockets and more to launch to Jupiter ...

The small, rocky body is constantly being stretched ... of interesting things happening under the surface. Callisto, the outermost of Jupiter’s 95 moons, first caught NASA’s attention back ...

Mercury has a rocky surface when, facing the sun ... as all of the remaining three gas giants – Jupiter, Uranus and Neptune – have faint rings. And as of June 2023, Saturn has 146 moons ...

"Scientifically there's a huge amount we can learn from asteroids," says Alan Fitzsimmons, an astronomer at Queens University ...

Barnard's Star is a small, dim star of the type that astronomers call red dwarfs. Consequently, even though it is one of the ...