HELSINKI — China’s Shijian-21 and Shijian-25 are conducting proximity operations for a second time high above the Earth as a precursor to an expected on-orbit refueling test.

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Andrew Jones covers China's space industry for SpaceNews. Andrew has previously lived in China and reported from major space conferences there. Based in Helsinki, Finland, he has written for National Geographic, New Scientist, Smithsonian Magazine, Sky...