If the object really is Planet Nine, it would be larger than Neptune and exist 700 times further from the sun than Earth.

A new study, however, identifies a possible candidate. A separate team of astronomers compared 1983 data from the Infrared ...

The hunt for Planet Nine—the solar system’s ghostly gravitational troll—is longstanding, and is based on the peculiar clustering of rocky bodies in the Kuiper Belt beyond the orbit of Neptune.

Astronomers searching for a ninth planet in our solar system say they've found a "good" candidate far beyond Neptune, according to a new preprint study. This could be humanity's first glimpse at the ...

Our solar system may have a ninth planet after all, following the declassification of Pluto nearly two decades ago, ...

The first week of the criminal trial for media mogul Sean “Diddy” Combs wrapped up after an emotional testimony from his ...

A ninth planet the size of Neptune may be hidden in the far reaches of the solar system, but the evidence has left some experts skeptical.

Scientists may have just spotted Planet Nine — a massive object orbiting 700 AU from the Sun. Data from two space telescopes ...

Astronomers have long speculated about an unseen planet lurking in the solar system's outer edge. This hypothetical world, dubbed Planet Nine, could explain the unusual clustering ...

The 950-foot hunk of primordial matter is classified as a "potentially hazardous asteroid," but that doesn't mean it has a ...

Astronomers claim to have discovered a new ninth planet in our Solar System. Planet Nine, also known as Planet X, is a hypothetical celestial object that would distantly orbit our Sun – but ...