WASHINGTON — NASA is supporting Boeing as it completes revisions to the company’s CST-100 Starliner spacecraft, ensuring it is available for crewed missions after the expected retirement of SpaceX’s Crew Dragon.

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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...