WASHINGTON — NASA and Roscosmos continue to disagree on the cause and severity of an air leak in the Russian segment of the International Space Station, one that NASA worries could lead to a “catastrophic failure” of part of a Russian module.

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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...