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Astronomy
Planets
Eris
Eris was discovered in 2006, as the article below indicates, it was the discovery of this object, bigger and further away than Pluto, that set the whole astronomical community on fire with the question "what is a planet?" And it has a moon named Dysnomia, too. After its discovery, the pair was nicknamed Xena and Gabriele after the popular TV show, but the IAU rejected that as a formal name.
CNN.com - Scientists: New 'planet' bigger than Pluto - Feb 1, 2006
Eris (dwarf planet) - Wikipedia, the free encyclopedia
ScienceDaily: Planet Eris (Xena) News
Former ‘10th planet’ officially named Eris - Space- msnbc.com
Dwarf Planet Eris - Planetary News | The Planetary Society
The Dwarf Planet Known As Eris Is More Massive Than Pluto
New Horizons, Pluto and the Kuiper Belt: Ice Worlds Beyond the Solar System (2014) (pdf)
Smaller objects from the Outer Solar System
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Last updated 2009 December 17