Detailed information on the 1962 Operation Ranch Hand that began involving chemical warfare using Agent Orange during the Vietnam War.

Detailed information on Sputnik, the first artificial satellite to orbit Earth, launched by the USSR on October 4, 1957.

Learn about the 1979 Three Mile Island Accident, the most serious accident in U.S. commercial nuclear power plant operating history.

This interesting NASA timeline provides the dates and facts about the important events and people involved in space exploration in the United States.