Learn how a possible ninth planet, the theoretical Planet X, could have acquired its wide orbit in the outer Solar System — a ...

Scientists hunting for the hypothetical Planet Nine have discovered a potential new dwarf planet, 2017 OF201, in the outer ...

They said: ‘The discovery of 2017 OF201 is significant because it’s found in a region of the Solar System thought to be empty ...

Given the name 2017 OF201, the object falls into a category called trans-Neptunian objects that orbit the sun at a distance ...

It's an evocative idea that has long bedeviled scientists: a huge and mysterious planet is lurking in the darkness at the ...

WASHINGTON: A group of scientists has found a strange new object about 435 miles wide at the far edge of the solar system. It ...

There’s a new object in the distant reaches of our solar system, and it might just offer clues to a long-standing cosmic ...

The TNO, which are described as minor planets that orbit the sun at a greater distance than Neptune, were found on the edge ...

an elusive planetary body that could change our understanding of the solar system, have found something. Planet X is a hypothetical planet seven times the mass of Earth tucked just behind Pluto.

Scientists have discovered a colossal object approximately 435 miles wide in the frigid outer reaches of our solar system, ...

A team of astronomers believe they may have discovered a new dwarf planet—just like Pluto—on the edge of our solar system.

In the cold, dark outskirts of planetary systems far beyond the reach of the known planets, mysterious gas giants and ...