Learn about the recently discovered trans-Neptunian object that may eventually join Pluto as a dwarf planet, found at the ...

Elon Musk, under the username "Kekius Maximus," has joined William Shatner in advocating for Pluto's reclassification as a ...

The International Astronomical Union, which reclassified Pluto as a dwarf planet in 2006, is the arbiter of such ...

For decades, our solar system was thought to have nine planets, with Pluto considered the smallest and farthest. But in 2006, ...

In 2006, the International Astronomical Union stopped classifying Pluto as our solar system’s ninth planet and demoted its ...

An international team used 40 years' worth of data from two space probes to track down what they believe are signs of this ...

The presence of another planet in the solar system could explain the odd movements of some of the bodies in the Kuiper Belt.

Current observations suggest that this body is notably different from the familiar dwarf planet Pluto. Unlike the spherical nature ... the criteria that comprise planetary status may require revising, ...