(From left) Chinese astronauts Zhang Xiaoguang, Nie Haisheng and Wang Yaping wave after getting out of the return capsule of the Shenzhou-10 spacecraft after it landed yesterday in the grasslands of north China’s Inner Mongolia region following a 15-day mission in space. China yesterday completed its longest manned space mission 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.