Astronomers have discovered a mysterious dwarf planet, 2017 OF201, far beyond Pluto. This discovery challenges existing ...

Although three times smaller than Pluto, researchers say 'Planet Nine' is still big enough to be considered a dwarf planet ...

a name proposed for a hypothetical world beyond Neptune more than a century ago. Back in 1930, astronomers were searching for Planet X when they discovered Pluto, which became our solar system's ...

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 ...

Even in our own solar system, distances seem infinite. Think of driving continuously at highway speed to Pluto. It would take ...

A US-based trio hunting this elusive world has stumbled on what appears to be a new dwarf planet in the solar system's outer ...