In the 1990s, NASA designed an experimental space plane meant to be a cost-effective alternative to expensive rockets. Called the X-33, it was based on a concept called SSTO — or “single stage to ...
Add Yahoo as a preferred source to see more of our stories on Google. Launch recap: Live updates from USSF-36 mission, which launched at 11:50 p.m. Aug. 21 from NASA's Kennedy Space Center Pad 39A.
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