LOS ANGELES — NASA and Boeing are preparing for a June 1 launch of the company’s CST-100 Starliner on a crewed test flight after analysis of a helium leak led to the discovery of a “design vulnerability” in the spacecraft’s propulsion system.

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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...