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ASTRONOMERS have discovered an object half the size of Pluto orbiting the Sun beyond Neptune which they say is threatening to rewrite theories about how the solar system was formed.
The body, which has been nicknamed Buffy, has an almost circular orbit which has baffled scientists as most objects in this area, known as the Kuiper Belt, have "highly eccentric" orbits.
The orbit is difficult to explain using previous theories about the solar system’s formation and has prompted a rethink. (...)