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The flight of Gemini 4 in June 1965 was conducted barely four years after the first Americans flew in space. It was a bold step by NASA to accomplish the first American spacewalk and to extend the U.S. flight duration record to four days. This would be double the experience gained from the six Mercury missions combined. This daring mission was the first to be directed from the new Mission Control at the Manned Spacecraft Center near Houston, Texas. It also revealed that: Working outside the spacecraft would require further study. Developing the techniques to rendezvous with another object in space would not be as straightforward as NASA had hoped. Living in a small spacecraft for several days was a challenging but necessary step in the quest for even longer flights. Despite the risks, the gamble that astronauts Jim McDivitt and Ed White undertook paid off. Gemini 4 gave NASA the confidence to attempt an even longer flight the next time. That next mission would simulate the planned eight-day duration of an Apollo lunar voyage. Its story is recounted in the next title in this series: Gemini 5: Eight Days in Space or Bust.

Extravehicular activity (Manned space flight) --- Space vehicles --- Space walk --- Spacewalk --- Walking in space --- Manned space flight --- Extravehicular activity --- Astronomy. --- Astronautics. --- Astrophysics. --- Popular Science in Astronomy. --- Aerospace Technology and Astronautics. --- Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics). --- Popular Science in Technology. --- Astronomical physics --- Astronomy --- Cosmic physics --- Physics --- Space sciences --- Aeronautics --- Astrodynamics --- Space flight --- Aerospace engineering. --- Space sciences. --- Technology. --- Applied science --- Arts, Useful --- Science, Applied --- Useful arts --- Science --- Industrial arts --- Material culture --- Science and space --- Space research --- Cosmology --- Aeronautical engineering --- Astronautics --- Engineering

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This third book of the Gemini mission series focuses on the flight that simulated in Earth orbit the duration of an eight-day Apollo mission to the Moon. After the proof-of-concept test flights Gemini 1, 2 and 3 (as described in GEMINI FLIES!) and the success of the first American EVA as well as the four-day U.S. mission (GEMINI 4), NASA gained the confidence to gradually increase mission time spent in orbit. This is the first known book to focus solely on the Gemini 5 mission and its challenges with equipment failures and difficult living conditions. The mission was targeted to double the endurance of the previous one, and as such was an integral stepping stone for an even more audacious mission four months later. Attempting the eight- and then fourteen-day durations would be an opportunity for America to gain the lead in space exploration over the Soviets. This mission pioneered the duration of a flight to the Moon and back three years before Apollo 8 made that journey, without a lunar landing, for the first time.

Aerospace engineering. --- Astronautics. --- Outer space—Exploration. --- Aerospace Technology and Astronautics. --- Space Exploration and Astronautics. --- Aeronautical engineering --- Aeronautics --- Astronautics --- Engineering --- Space sciences --- Astrodynamics --- Space flight --- Space vehicles --- Extravehicular activity (Manned space flight) --- Space flight to the moon. --- Project Gemini (U.S.) --- Flight to the moon --- Lunar expeditions --- Lunar flight --- Space walk --- Spacewalk --- Walking in space --- Manned space flight --- Extravehicular activity --- Gemini Project (U.S.) --- Man-in-space Program (U.S.)