China is preparing to launch its second space station cargo mission just as its Shenzhou-12 astronauts are set to return to Earth. The Long March 7 rocket carrying the Tianzhou-3 cargo spacecraft rolled out at the Wenchang Satellite Launch Center, south China, early September 16, China’s human spaceflight agency announced. Launch is targeted for September 20, according to local traffic restrictions. Tianzhou-3 is expected to carry supplies, equipment and propellant to the Tianhe space station core module in preparation for the arrival of Shenzhou-13. The three-crew, six-month-long Shenzhou-13 mission is set to launch from Jiuquan, northwest China, in October. Tianhe...