WASHINGTON — NASA and Axiom Space are indefinitely delaying a private astronaut mission to the International Space Station after detecting a “new pressure signature” in a part of the station that has had a long-running air leak.

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Jeff Foust writes about space policy, commercial space, and related topics for SpaceNews. He earned a Ph.D. in planetary sciences from the Massachusetts Institute of Technology and a bachelor’s degree with honors in geophysics and planetary science...