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The nuclear-powered space probe has traveled 4 billion miles (6.4 billion km) to come within 2,200 miles (3,540 km) of Ultima Thule, an apparently peanut-shaped, 20-mile-long (32-km-long) space rock in the uncharted heart of the Kuiper Belt. Engineers at Johns Hopkins Applied Physics Laboratory in Maryland cheered when the spacecraft's first signals came through the National Aeronautic and Space Agency's Deep Space Network at 10:28 a.m. EST (1528 GMT).
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