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Astronomers find mini-planet in solar system's backyard

Cape Canaveral: Astronomers have found a dwarf planet far beyond the orbit of Pluto and can only guess how it got there.

The diminutive world, provisionally called "2012 VP 113" by the international Minor Planet Center, is estimated to be about 280 miles (450 km) in diameter, less than half the size of a neighboring dwarf planet named Sedna discovered a decade ago.

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