4 things to know about China’s longest-ever crewed spaceflight mission

China’s Shenzhou-13 spacecraft is about to begin its voyage to the Tiangong space station. The spaceflight is set to feature a range of pioneering moments and intriguing tasks. Here are four key facts about the mission. It’s China’s longest crewed mission yet The crew is heading for Tiangong, China’s first long-term space station, which is being constructed in low Earth orbit. China aims to complete the station by December 2022. The six-month mission will be the longest time that Chinese astronauts have ever stayed in space, but the crew should have plenty to keep them occupied. They’ll be based aboard the 54-foot-long…

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