Edward H. White was the first U.S. astronaut to complete extravehicular activity.

The Gemini program was the United States' second human spaceflight program, an interim step designed to bridge the technological gulf between the early Mercury flights and the Apollo lunar-landing program. The National Aeronautics and Space Administration (NASA) announced plans for Gemini on December 7, 1961, two months before John Glenn's historic Mercury mission. Like Mercury, the Gemini spacecraft was built by the McDonnell Aircraft Corporation, but unlike its predecessor, Gemini carried a two-person crew. This inspired NASA to name the program after the third constellation of the zodiac, which featured the twin stars Castor and Pollux. Altogether, the Gemini program involved twelve flights, including two unpiloted flight tests of equipment.

Program Objectives and Spacecraft Features

From a pilot's perspective, the Gemini spacecraft represented a major advance over Mercury in design and capability. Gemini was designed to rendezvous...