Almost 10 years ago, a NASA spacecraft was able to take several photos of Pluto, known for decades as a planet before it was ...

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 ...

Credit: Mashable At its closest approach, the dwarf planet will be just outside the orbit of Haumea ... have studied other dwarf planets like Eris, Makemake and 2007 OR10 from Earth to try ...

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 ...

The astronomer who compiled the data says it may capture just a small fraction of dwarf planets in the solar system. Meanwhile, a new definition of "planet ... an object's orbit, and the mess ...