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 ...

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 ...

In 2005, Eris was discovered. It was considered the largest known dwarf planet in the solar system until a year later when Pluto was downgraded from being a planet. In 2008, tribal violence ...

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 ...

But the real nail in the planetary coffin came in 2005, when astronomer Mike Brown discovered Eris ... but not clear its ...

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 ...

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 ...

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 ...

After about 30 hours of contact, Charon separated from Pluto and began to migrate into the orbit it has today. Denton and colleagues found that two other pairs of objects, dwarf planet Eris and ...

For one thing, Eris shares the region and isn't stuck in Pluto's orbit. The end result? Pluto is bumped from "planet" to "dwarf planet." Now, Stern argues that a dwarf planet is a kind of planet.