Perihelion is the point at which an orbiting body is closest to the sun. The word comes from Greek and literally means around ...

Discovered on July 1 by the NASA-funded ATLAS telescope in Chile, 3I/ATLAS is only the third confirmed visitor from another ...

Uranus sits far beyond the orbit of Saturn, yet its smallest moons are suddenly at the center of a quiet revolution in outer ...

The solar system's oddball planet has some pretty odd moons, too. The first infrared spectra of Uranus's small inner moons, ...