An object seen to have moved in the time between when it was imaged by the IRAS and AKARI surveys in 1983 and 2006 ...

The solar system consists of our star, the sun, and everything bound to it by gravity: the planets Mercury, Venus, Earth, ...

The presence of another planet in the solar system could explain the odd movements of some of the bodies in the Kuiper Belt.

What just happened? A newly identified object spotted in two infrared sky surveys may be the most substantial evidence for the elusive Planet Nine – a potential Neptune-sized world orbiting ...

But astronomers may have found new evidence that points to a celestial body that could be a possible candidate as "Planet Nine," according to a new paper, which has been accepted for publication ...

For about a decade, he and other researchers have been trying to prove that the so-called "Planet 9" exists. So far, the only evidence has come from some oddities in the orbits of small Pluto-like ...

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.

Neptune and then the possible Planet Nine. It's a dynamic system shaped by gravity and time, and while we've learned a lot, it still holds plenty of mysteries. In this guide, we'll explore how the ...

But astronomers may have found new evidence that points to a celestial body that could be a possible candidate as "Planet Nine," according to a new paper, which has been accepted for publication ...