Astronomers are closing in on one of the most tantalizing possibilities in planetary science, evidence that a previously ...

The newly identified cluster of Kuiper Belt objects lies about 4 billion miles from the Sun, offering fresh clues about how ...

Astronomers at Princeton University have uncovered evidence that the outer solar system is more structured than long believed ...

With sapphire waterfalls, lava rain and orbits around dead stars, these distant worlds push the limits of what’s possible.

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

Far beyond Neptune, something heavy appears to be tugging on the outer solar system, bending the paths of distant icy worlds ...

A Carnegie-led team of astronomers detected the strongest evidence yet of an atmosphere around a rocky planet beyond our ...

The giant planets weren't always where we find them today. Jupiter, Saturn, Uranus and Neptune formed in a more compact configuration and later underwent a violent reshuffling that scattered them to ...

The upcoming year will offer a blood-red moon, spectacular meteor showers and the first glimpse of the sun’s corona since ...

Jupiter's moon Europa is on the short list of places in our solar system seen as promising in the search for life beyond ...

Two separate research teams have observed a previously unseen microlensing event, confirming the existence of a particular ...

Researchers have confirmed the mass of a free-floating planet thanks to a lucky convergence of ground- and space-based ...