A possible new dwarf planet has been discovered at the edge of our solar system, so far-flung that it takes around 25,000 ...

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

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

U.S. astronomers hunting for "Planet Nine" have instead stumbled on what appears to be a new dwarf planet in the solar system ...

As a result of the International Astronomical Union’s 2006 demotion of Pluto from planet to dwarf planet, our solar system ...

For the unversed, "Planet Nine" is a hypothetical planet which is reportedly larger than Earth that is thought to orbit ...

Astronomers have spotted a cosmic mismatch that has left them perplexed - a really big planet orbiting a really small star.

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

Plus, an in-depth look at how the West Texas city of Seminole reacted when a measles outbreak tore through the region.

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

A newly identified dwarf planet, named 2017 OF201, has been discovered in the distant outer reaches of the solar system.