Many attempts have been made to find the so-called "Planet Nine", but all have – so far – been fruitless. In a new paper, a team claims to have their own explanation: our theory of gravity is wrong.

As planetary rings go, Neptune’s are especially dim—we couldn’t even confirm they existed until Voyager 2 got a close look at the planet in 1989. Since then, Neptune’s rings have been imaged by JWST ...

Because the solar system's contents formed from a disk around the sun, we would expect the orbits of everything orbiting the sun to keep relatively close to the plane of that disk. However, some don’t ...

You probably already know that gravity can greatly influence cosmic objects as they make their way through space. We see this constantly in how the Sun's gravity causes planets to orbit it. And even ...

New images from the space-based observatory offer a novel view of the planet in infrared. By Jonathan O’Callaghan No spacecraft has visited Neptune since 1989, when the NASA probe Voyager 2 flew past ...

In 1906, astronomer and businessman Percival Lowell launched a search for "Planet X," a hypothetical giant planet orbiting the sun beyond Neptune. Lowell was convinced that Planet X existed based on ...

Though the rings appear solid from afar, they’re actually a dynamic, rotating system of icy debris. One theory suggests they may be remnants of a moon or comet torn apart by Saturn’s immense gravity.

Lying at the very outskirts of our solar system, the ice giant Neptune has long represented both a challenge and a mystery to astronomers and space explorers alike. The dark and cold planet, the ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. This article is more than 3 years old. This global color ...

A passing star, or a stellar flyby, with the potential to pull Neptune out of its orbit by just 0.1%, could mean catastrophe for the entire solar system. But don’t worry — it won’t happen in our ...

Like many scientists before him, Caltech Graduate Student Thomas McCord was searching for other answers when he made his unexpected discovery. Curious about the odd behavior of the planet Neptune’s ...