SEATTLE — SpaceX postponed the Jan. 6 launch of a Falcon 9 rocket because of a technical problem with the vehicle’s upper stage, delaying the delivery of supplies to the international space station and a demonstration of the potential reusability of the rocket’s lower stage.

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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...