A ninth planet may exist beyond Neptune in the Kuiper Belt, a region populated by icy bodies that orbit the Sun.

The search for Planet Nine has been on for years. Mysterious pulls in the Kuiper Belt have led scientists to believe a hidden ...

After a decade-long search, some scientists say a growing number of clues point to the existence of a hidden planet in the ...

When you get out past the planets of our solar system and keep going, you will eventually enter the Kuiper belt, which has ...

The solar system has nine planets, but in 2006 the International Astronomical Union declared Pluto a dwarf planet, making the ...

In 2016, scientists Michael Brown and Konstantin Batygin suggested that an unseen Planet Nine could explain the unusual orbits of some Kuiper Belt objects, sparking interest in its possible existence ...

Astronomers are investigating the possibility of a hidden ninth planet beyond Neptune, which could explain unusual orbital patterns in the Kuiper Belt.

A study recently published in the journal Nature Astronomy upends conventional wisdom regarding the formation and stability of pairs of orbiting objects in the Kuiper Belt beyond the planet Neptune.

Brown, a professor of planetary astronomy at Caltech, discovered another small world called Eris in the Kuiper Belt — a vast ring of icy objects beyond Neptune’s orbit that also happens to be ...

The search for Planet Nine, a hidden world beyond Neptune, is heating up as scientists prepare to use a powerful new telescope.

A joint Hubble and James Webb Space Telescope (JWST) project to learn more about the dusty disk around the bright star Vega ...