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spacex has launched the u.s. air force's most powerful gps satellite ever built.
spacex公司将美国空军最先进的gps卫星送入太空。
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the satellite was supposed to soar tuesday but rocket concerns and then weather delayed the flight.
heather wilson, secretary of the air force, says this next-generation gps satellite is three times more accurate than previous versions and eight times better at anti-jamming. it's the first in a series and nicknamed vespucci after the 15th-century italian explorer who calculated earth's 4 to within 50 miles (80 kilometers).
lockheed martin developed the advanced gps technology and is building the satellites at a facility near denver.
sunday's launch was space x's 21st and final launch of the year, a company record.
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