Scientists have identified an object about 700km wide inhabiting the frigid outer reaches of our solar system that might ...

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

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

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 ...

As explained in a pre-press paper [PDF] titled “Discovery of a dwarf planet candidate in an extremely wide orbit: 2017 OF201” ...

Almost 20 years after Pluto was infamously downgraded from its status as a planet, scientists now believe they have ...

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

It is an evocative idea: a huge and mysterious planet is lurking in the darkness at the edge of our solar system, evading all ...

Scientists have recently spotted a huge object far away in the cold outer reaches of our solar system. This ...

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