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 led to a new way to describe the Solar System and heralded the eventual change of Pluto’s planetary status. On that ...

Original image has been replaced. Credit: Mashable Scientists have studied other dwarf planets like Eris, Makemake and 2007 OR10 from Earth to try to understand what the distant worlds might be like.

The dwarf planet that actually helped spark the discussion of clearly defining a planet was Eris, discovered in 2005. Eris is similarly sized to Pluto, but it's three times further from the Sun ...