The Ozone Layer After two decades of probing the atmosphere with a welter of instruments carried on spacecraft, weather balloons and highflying U-2 aircraft, researchers thought the case was closed: man-made chemicals known as chlorofluorocarbons (CFCs) drift into the stratosphere, break down and...

This report is going to be based on the NASA Mercury Program. The primary goals of this report is to explain the mission and purpose of the program, to give you an overview of the program, to explain the spacecraft used in the program, and to give flight summaries. Beginning in 1958 and culminat...