Astronomers have found a large world of ice and rock circling the Sun beyond the most distant planet, Pluto.
Preliminary observations suggest it may be up to 1,800 km across, making it the largest body other than a true planet to be discovered orbiting the Sun.
Designated 2004 DW, it was found on 17 February by an automated sky survey telescope in California.
Since 1992 some 800 bodies have been found in the outer Solar System, five could be larger than 1,000 km across.
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