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A comment on China prepares mission to land spacecraft on moon's far side. Parent comment
https://arstechnica.com/science/2016/02/meet-nasas-new-x-pla...
Hypersonic is five or six times the speed of sound.
It would of course be nice to have both.
https://arstechnica.com/science/2016/02/meet-nasas-new-x-pla...