The International Astronomical Union’s Minor Planet Center, which catalogs new moons and other small bodies in the solar ...

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

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

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

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

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 ...