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Falcon Hypersonic Technology Vehicle 2 (HTV-2) is shown in this undated artist's conception, released August 11, 2011. The unmanned U.S. hypersonic glider blasted off from a California air force base on Thursday on a test flight aimed at reaching 20 times the speed of sound, but ground control lost contact with the flight after about 36 minutes, a Pentagon agency said. (Xinhua/Reuters) |
Chinese president meets UNESCO head