
China’s first satellite-to-satellite refuelling test appears to be imminent after a second round of close-proximity operations between two probes in high orbit on Monday.The landmark Chinese mission will be one of the most ambitious attempts at autonomous satellite servicing in geostationary orbit, which rival the United States has yet to achieve.On Monday, the Shijian-21 and Shijian-25 spacecraft – both orbiting at an altitude of 35,786km (22,236 miles) above the equator – came within...