WASHINGTON, July 18 (Xinhua) -- U.S. space firm SpaceX on Monday successfully landed the first stage of its Falcon 9 rocket on ground again after launching commercial cargo to the International Space Station.
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WASHINGTON, July 18 (Xinhua) -- U.S. space firm SpaceX on Monday successfully landed the first stage of its Falcon 9 rocket on ground again after launching commercial cargo to the International Space Station.