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China's first cargo spacecraft Tianzhou-1 blasts off from Wenchang Space Launch Center in south China's Hainan province, April 20, 2017. (Xinhua/Ju Zhenhua)

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China's first cargo spacecraft Tianzhou-1, atop a Long March-7 Y2 carrier rocket, blasts off from Wenchang Space Launch Center in south China's Hainan province, April 20, 2017. China declared the launch of Tianzhou-1 a success, as it entered designated orbit Thursday night, marking a crucial step for the country in building a space station by approximately 2022. (Xinhua/Ju Zhenhua)

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China's first cargo spacecraft Tianzhou-1, atop a Long March-7 Y2 carrier rocket, blasts off from Wenchang Space Launch Center in south China's Hainan province, April 20, 2017. China declared the launch of Tianzhou-1 a success, as it entered designated orbit Thursday night, marking a crucial step for the country in building a space station by approximately 2022. (Xinhua/Yang Guanyu)

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China's first cargo spacecraft Tianzhou-1, atop a Long March-7 Y2 carrier rocket, blasts off from Wenchang Space Launch Center in south China's Hainan province, April 20, 2017. China declared the launch of Tianzhou-1 a success, as it entered designated orbit Thursday night, marking a crucial step for the country in building a space station by approximately 2022. (Xinhua/Guo Cheng)

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China's first cargo spacecraft Tianzhou-1, atop a Long March-7 Y2 carrier rocket, blasts off from Wenchang Space Launch Center in south China's Hainan province, April 20, 2017. China declared the launch of Tianzhou-1 a success, as it entered designated orbit Thursday night, marking a crucial step for the country in building a space station by approximately 2022. (Xinhua/Zhao Yingquan)

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China's first cargo spacecraft Tianzhou-1, atop a Long March-7 Y2 carrier rocket, blasts off from Wenchang Space Launch Center in south China's Hainan province, April 20, 2017. China declared the launch of Tianzhou-1 a success, as it entered designated orbit Thursday night, marking a crucial step for the country in building a space station by approximately 2022. (Xinhua/Zhao Yingquan)

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China's first cargo spacecraft Tianzhou-1, atop a Long March-7 Y2 carrier rocket, blasts off from Wenchang Space Launch Center in south China's Hainan province, April 20, 2017. China declared the launch of Tianzhou-1 a success, as it entered designated orbit Thursday night, marking a crucial step for the country in building a space station by approximately 2022. (Xinhua/Yang Guanyu)

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China's first cargo spacecraft Tianzhou-1, atop a Long March-7 Y2 carrier rocket, blasts off from Wenchang Space Launch Center in south China's Hainan province, April 20, 2017. China declared the launch of Tianzhou-1 a success, as it entered designated orbit Thursday night, marking a crucial step for the country in building a space station by approximately 2022. (Xinhua/Ju Zhenhua)

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China's first cargo spacecraft Tianzhou-1, atop a Long March-7 Y2 carrier rocket, blasts off from Wenchang Space Launch Center in south China's Hainan province, April 20, 2017. China declared the launch of Tianzhou-1 a success, as it entered designated orbit Thursday night, marking a crucial step for the country in building a space station by approximately 2022. (Xinhua/Ju Zhenhua)

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China's first cargo spacecraft Tianzhou-1, atop a Long March-7 Y2 carrier rocket, blasts off from Wenchang Space Launch Center in south China's Hainan province, April 20, 2017. China declared the launch of Tianzhou-1 a success, as it entered designated orbit Thursday night, marking a crucial step for the country in building a space station by approximately 2022. (Xinhua/Guo Cheng)