The primary structure o SNC’s first Dream Chaser is ready to be integrated with other components over the next 18 months. Credit: Sierra Nevada Corp.

A decade ago, the idea of relying on commercial spacecraft to deliver cargo to the International Space Station was still very much of an experiment. NASA awarded contracts in late 2008 to both Orbital Sciences Corp. and SpaceX as part of its Commercial Resupply Services (CRS) program for cargo transportation, but both companies were still years away from flying their vehicles. Another company, Rocketplane Kistler, had already been dropped from the program by NASA when it failed to meet funding milestones; it eventually went bankrupt.

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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...