Gemini 5

Key facts

Mission & specifications

Mission

Gemini 5 turned the young American space programme into an endurance test. Launched on 21 August 1965, Gordon Cooper and Pete Conrad set out to spend eight days in orbit — as long as a round trip to the Moon — at a time when no American had flown for more than four days and physicians still worried that a week of weightlessness might harm the body. The flight was nearly cut short within hours: its fuel cells, carried for the first time to give a capsule the electrical power a long mission needs, lost pressure, and the crew had to power down and coax the system back to life. They pressed on for 120 orbits, and on 26 August passed the Soviet Vostok 5 mark — the first time an American mission held the world record for spaceflight duration. Cooper and Conrad splashed down on 29 August after just under eight days, a flight trimmed only slightly by an approaching hurricane. Gemini 5 proved that crew, spacecraft and fuel cells alike could last the length of an Apollo mission — the endurance the Moon landings would demand.

1. 1965Gemini 5 launchesLaunch

   Cooper and Conrad set out to endure eight days in orbit — the length of a round trip to the Moon.

2. 1965First flight of fuel cellsMilestone

   Gemini 5 is the first spacecraft powered by fuel cells; a pressure drop hours after launch nearly ends the flight before the crew nurse the system back.

3. 1965A new endurance recordMilestone

   Passing the Soviet Vostok 5 mark, an American crew holds the world spaceflight-duration record for the first time.

4. 1965Splashdown after nearly eight daysMission end

   Cooper and Conrad return after 120 orbits and just under eight days — proof a crew could last a Moon-length mission.

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