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A European probe approaching a comet in deep space has found the body's surface to be relatively warm, suggesting it has a mostly "dark, dusty crust," mission controllers said Friday. Thermal readings were taken by the unmanned spacecraft Rosetta as it neared Comet 67P/Churyumov-Gerasimenko on the final leg of a six-billion-kilometre (3.75-billion-mile), 10-year pursuit. Using an infrared spectrometer, Rosetta scanned the comet between July 13 and 21, when the distance between them closed from 14,000 kilometres (8,750 miles) to just over 5,000 kilometres, the European Space Agency (ESA) said. At the time, the comet was about 555 million kilometres from the Sun.