In a period of a little more than sixty years since the first flight of the Wright Brothers, man\'s exploration of three-dimensional space above the surface of the Earth has extended beyond the atmosphere.
Although the X-15 has had its share of newsworthy milestones, its contri.
Behind these milestones of practical flight have been less publicized achievements in scientific research, making such progress possible.
Spectacular and exciting events in this dramatic quest have been well publicized.
In a period of a little more than sixty years since the first flight of the Wright Brothers, man\'s exploration of three-dimensional space above the surface of the Earth has extended beyond the atmosphere