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Pictures from the dwarf planet Pluto shows it has huge ice mountains and canyons as big as anything on Earth. But it had been expected to have craters too having been battered by rocks in the Kuiper Belt - but there are no signs. Astronomer and Science writer Nigel Henbest gives us his reaction (Photo: A close-up image of a region near Pluto's equator shows a range of mountains rising as high as 11,000 feet (3,500 meters). Credit:NASA/APL/SwRI via Getty Images)