Next-X ?

1999-01-06T00:00:00

From the highs of the X-15's flights at over six times the speed of sound to the lows of the early-1990s' cancellation of the over-ambitious X-30 single-stage-to-orbit aerospace plane, the USA's "X-" series of experimental vehicles has exemplified the country's drive for dominance in the aeronautical and space technology arenas.

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