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The return capsule of the Shenzhou-10 spacecraft prepares to land in the grasslands of north China's Inner Mongolia region on June 26, 2013, after a 15-day mission in the space. China completed its longest manned space mission on June 26 as its Shenzhou-10 spacecraft and three crew members safely returned to Earth, in a major step towards Beijing's goal of building a permanent space station by 2020. AFP PHOTOAFP/AFP/Getty Images ( 520891179 )

The return capsule of the Shenzhou-10 spacecraft lands in the grasslands of north China's Inner Mongolia region on June 26, 2013, following a 15-day mission in space. China completed its longest manned space mission on June 26 as its Shenzhou-10 spacecraft and three crew members safely returned to Earth, in a major step towards Beijing's goal of building a permanent space station by 2020. AFP PHOTOAFP/AFP/Getty Images ( 520891594 )

Technicians inspect the return capsule of the Shenzhou-10 spacecraft carrying three Chinese astronauts after it landed in the grasslands of north China's Inner Mongolia region on June 26, 2013, following a 15-day mission in space. China completed its longest manned space mission on June 26 as its Shenzhou-10 spacecraft and three crew members safely returned to Earth, in a major step towards Beijing's goal of building a permanent space station by 2020. AFP PHOTOAFP/AFP/Getty Images ( 520891605 )

Ground crew helps a Chinese astronaut exit from the re-entry capsule of China's Shenzhou-10 spacecraft after it returning to earth at its main landing site in north China's Inner Mongolia Autonomous Region, June 26, 2013. Three Chinese astronauts returned to Earth on Wednesday, touching down in north China's Inner Mongolia after a successful 15-day mission in which they docked with a manned space laboratory. REUTERS/Stringer ( CHINA-SPACE/ )

Chinese astronaut Zhang Xiaoguang (C) is helped by technicians to get out from the Shenzhou-10 spacecraft after it landed in the grasslands of north China's Inner Mongolia region on June 26, 2013, following a 15-day mission in space. China completed its longest manned space mission on June 26 as its Shenzhou-10 spacecraft and three crew members safely returned to Earth, in a major step towards Beijing's goal of building a permanent space station by 2020. AFP PHOTOAFP/AFP/Getty Images ( 520891236 )

Chinese female astronaut Wang Yaping (C) waves after getting out from the Shenzhou-10 spacecraft after it landed in the grasslands of north China's Inner Mongolia region on June 26, 2013, following a 15-day mission in space. China completed its longest manned space mission on June 26 as its Shenzhou-10 spacecraft and three crew members safely returned to Earth, in a major step towards Beijing's goal of building a permanent space station by 2020. AFP PHOTOAFP/AFP/Getty Images ( 520891235 )

Chinese astronaut Wang Yaping waves after she gets out from the re-entry capsule of China's Shenzhou-10 spacecraft returning to earth at its main landing site in north China's Inner Mongolia Autonomous Region, June 26, 2013. Three Chinese astronauts returned to Earth on Wednesday, touching down in north China's Inner Mongolia after a successful 15-day mission in which they docked with a manned space laboratory. REUTERS/Stringer ( CHINA-SPACE/ )

Chinese astronaut Nie Haisheng (4th R) gets out out of the Shenzhou-10 spacecraft that landed on the grasslands of north China's Inner Mongolia region on June 26, 2013, after a 15-day mission in space. China completed its longest manned space mission on June 26 as its Shenzhou-10 spacecraft and three crew members safely returned to Earth, in a major step towards Beijing's goal of building a permanent space station by 2020. AFP PHOTOSTR/AFP/Getty Images ( 520893288 )

Technicians inspect the return capsule of the Shenzhou-10 spacecraft after it landed in the grasslands of north China's Inner Mongolia region on June 26, 2013, following a 15-day mission in space. China completed its longest manned space mission on June 26 as its Shenzhou-10 spacecraft and three crew members safely returned to Earth, in a major step towards Beijing's goal of building a permanent space station by 2020. AFP PHOTOAFP/AFP/Getty Images ( 520891603 )

Chinese astronaut Nie Haisheng (4th R) waves after he gets out of the Shenzhou-10 spacecraft that landed on the grasslands of north China's Inner Mongolia region on June 26, 2013, after a 15-day mission in space. China completed its longest manned space mission on June 26 as its Shenzhou-10 spacecraft and three crew members safely returned to Earth, in a major step towards Beijing's goal of building a permanent space station by 2020. AFP PHOTOSTR/AFP/Getty Images ( 520893243 )

Astronauts Zhang Xiaoguang, Nie Haisheng and Wang Yaping, from left to right, join hands after they got out of the re-entry capsule of China's Shenzhou 10 spacecraft following its successful landing at the main landing site in Siziwang Banner, north China's Inner Mongolia Autonomous Region on Wednesday, June 26, 2013. The Chinese space capsule with three astronauts safely landed Wednesday on the country's northern grasslands after a 15-day trip to a prototype space station, marking the latest success for China's manned space program as it enters its second decade. (AP Photo/Xinhua, Wang Jianmin) ( China Space )

Chinese astronauts (L-R) Zhang Xiaoguang, Nie Haisheng and Wang Yaping wave after getting out from the return capsule of the Shenzhou-10 spacecraft after it landed in the grasslands of north China's Inner Mongolia region on June 26, 2013 following a 15-day mission in space. China completed its longest manned space mission on June 26 as its Shenzhou-10 spacecraft and three crew members safely returned to Earth, in a major step towards Beijing's goal of building a permanent space station by 2020. AFP PHOTOAFP/AFP/Getty Images ( 520891569 )