The three astronauts currently stationed on China’s Tiangong space station will extend their stay by around a month, state broadcaster CCTV said on Friday. The crew lifted off from the Jiuquan Satellite Launch Centre on October 31 on board the Shenzhou-21 vessel and were expected to return to Earth at the end of this month after a standard six-month mission. In November, a crack was discovered in a window of the Shenzhou-20 spacecraft, forcing the space station’s previous crew to extend their...