The Shenzhou-21 astronauts returned to Earth on Friday after staying in Tiangong space station for more than 200 days, establishing the record for longest on-orbit stay by a Chinese crew. The trio touched down at the Dongfeng landing site in the Inner Mongolia autonomous region at around 8.11pm aboard the Shenzhou-22 spacecraft, according to state broadcaster CCTV. Their stay was extended by one month after their probe was used in an emergency mission for the previous crew to return home last...