The discovery of Eris resulted in the reclassification of Pluto as a dwarf planet, sparking a huge debate in the astronomical community. For this study, Francis Nimmo of the University of ...

After a decade-long search, some scientists say a growing number of clues point to the existence of a hidden planet in the Kuiper Belt beyond Neptune — and they may soon have the opportunity to find ...

In the time Pluto was found, classified as a planet and reclassified as a dwarf planet, it has not completed one orbit. One ...

Related: Dwarf Planet Eris is 'Almost Perfect' Pluto ... a Caltech astronomer who had led the discovery of Eris in 2005 and is best known as the man who killed Pluto, estimated the mass for ...

Today, when tens of thousands of minor planets have been discovered ... as Pluto and Eris—the International Astronomical Union in 2006 recommended that they be called "dwarf planets"—much ...

The solar system has nine planets, but in 2006 the International Astronomical Union declared Pluto a dwarf planet, making the ...

Astronomers have discovered ... planet, orbiting a distant star 4,000 light years away in the constellation Sagittarius. This rocky planet, roughly the same size and mass as Earth, circles a white ...

On a small dwarf planet called Makemake, astronomers have seen signs of surprising temperature changes. These could indicate ...

The discovery highlights the complexity of star and brown dwarf formation. Scientists remain unsure about the precise transition between giant planets and brown dwarfs, and this new configuration ...

is a disc-shaped region beyond the orbit of Neptune’s in the outer solar system—50 Earth-sun distances—that’s home to dwarf planets like Pluto, Makemake and Eris. It’s also thought to be ...

In 2006, the International Astronomical Union (IAU) voted on the definition of a planet. Famously ... when astronomer Mike Brown discovered Eris, an object about the same size as Pluto orbiting ...