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Published online 14 June 2007 | Nature | doi:10.1038/news070611-10
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Dwarf planet found to be heftier than Pluto
Eris is bigger and heavier than our Solar System's 'ninth planet'.
Whether you call it a planet or not, Pluto has officially been overtaken by a more massive planetary object — Eris (previously nicknamed Xena).
Pluto, traditionally known as the ninth planet of our Solar System, sits in a giant zone called the Kuiper belt that is filled with asteroids and many other planetary bodies.
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