When astronomers found a large world farther out than Pluto, it became one of the final nails in the coffin of our ninth ...

The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

It saw the discovery of dwarf planet Eris and how those very observations ... distant worlds, far beyond the orbit of Neptune. At the time, some people speculated on whether they should be ...

Of the five dwarf planets in the Solar System – including Eris, Ceres, Makemake ... there was a difference between the observed orbit of Uranus and the way Newtonian physics predicted its ...

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 ...

Although Pluto's orbit was more elongated than the other planets ... such as Pluto and Eris—the International Astronomical Union in 2006 recommended that they be called "dwarf planets ...

The dwarf planet is a bizarre, cryovolcanic world. However, the organic deposits discovered on its surface so far are unlikely to originate from its interior. The organic material found in a few areas ...

After getting intimate, they began spinning like a “cosmic snowman” and remained linked in orbit after separating ... such as the dwarf planets Eris and Orcus and their respective moons ...

Each ring represents an object's orbit, and the mess ... and the randomness of the dwarf planets is quite apparent." Brown is the person who discovered Eris, a 10th solar system object that's ...