In 2006, the International Astronomical Union demoted Pluto to one of dozens of dwarf planets. After its discovery in 1930, Pluto was declared the ninth planet in our solar system and quickly ...

"It is potentially large enough to qualify as a dwarf planet. Its orbit is very wide and eccentric, which means it experienced an interesting orbital migration path in the past," said astrophysicist ...

WASHINGTON (Reuters) -Scientists have identified an object about 435 miles (700 km) wide inhabiting the frigid outer reaches of our solar system that might qualify as a dwarf planet, spotting it as it ...

An imagined view of the three planets orbiting an ultracool dwarf star just 40 light-years from Earth was discovered using a specialist telescope at ESO's La Silla Observatory in Chile.

Pluto, the largest of those dwarf planets, has a diameter of about 1,477 miles (2,377 km). The mass of 2017 OF201 is estimated to be about 20,000 times smaller than Earth's and 50 times smaller ...

WASHINGTON - Scientists have identified an object about 435 miles (700 km) wide inhabiting the frigid outer reaches of our solar system that might qualify as a dwarf planet, spotting it as it ...

Possible New Dwarf Planet Spotted Near the Edge of the Solar System By Will Dunham WASHINGTON (Reuters) -Scientists have identified an object about 435 miles (700 km) wide inhabiting the frigid ...

The evidence for it that hunters have long clung to is how six objects – dwarf planets and icy balls – have been discovered in the vastly empty outskirts of the solar system. Bizarrely ...

Now, a US-based trio hunting this elusive world has instead stumbled on what appears to be a new dwarf planet in the solar system's outer reaches. And the existence of this new kid on the block ...