A potential new dwarf planet has been discovered in the outer reaches of the solar system, and its existence poses the ...

As it orbits the sun once every 25,000 years, the celestial body 2017 OF201 travels beyond the Kuiper Belt into a region ...

The small world was found during a search for the hypothetical Planet Nine, and astronomers say the next time it will reach ...

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

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

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

A new dwarf planet discovery in the outer solar system is challenging the long-standing theory of a hidden giant planet ...

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

Pluto, the largest of those dwarf planets, has a diameter of about 1,477 ... posted on the open-access research site arXiv, opens new tab. The study has not yet been peer reviewed.

The object is about 700 kilometres wide and lies nearly three times farther from Earth than Neptune. Its highly elongated ...

"It's very rare to discover an object both large and with an exotic orbit." A potential new dwarf planet has been discovered in the outer reaches of the solar system, and its existence poses the ...

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