WASHINGTON — Sierra Space says it has wrapped up a series of environmental tests of its Dream Chaser cargo spaceplane at a NASA facility in Ohio and is ready to ship the spacecraft to Florida for a launch later this year.

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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...