There are two phases of man's navigation of space: the going out and the coming back. The Air Force's Pioneer demonstrated that the day is near at hand when a missile will soar out into free space. Last week North American Aviation, Inc. rolled out its X-15 a stub-winged, hard-shelled rocket.plane designed to study the other end of the problem: how to get a man back safely from outer space.
With its soft. length and 22-ft. wingspan, the X-15 looks more like a missile than an airplane. A sophisticated descendant of the X-1 rocket...
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