Far out in the Saturn system, a small world refuses to behave. Iapetus spins in a way that should not be so stable, wears a ...

Saturn’s largest moon has long looked like a frozen time capsule of early Earth, but a new set of measurements has upended ...

So far, humanity has yet to find its first "exomoon"—a moon orbiting a planet outside of the solar system. But that hasn't ...

Grab-and-go missions to asteroids have provided some of the most scientifically valuable samples since the Apollo ...

A growing fleet of privately built spacecraft is preparing to attempt robotic landings on the moon as humanity's exploration ...

Tiny bits of Earth’s atmosphere have been drifting to the moon for billions of years, guided by Earth’s magnetic field.