Ed White makes the first American spacewalk
NASA answers Leonov's spacewalk with a 23-minute excursion powered by a hand-held oxygen gun
Quick facts
- Agency
- NASA
- Mission
- Gemini 4
- Spacewalk duration
- 23 minutes
- Astronauts
- James McDivitt, Ed White
What happened
During the Gemini 4 mission, astronaut Ed White became the first American to leave a spacecraft in orbit, exiting the capsule on 3 June 1965 while commander James McDivitt remained inside and photographed him. White was secured to the spacecraft by a 25-foot umbilical line wrapped in gold tape and maneuvered himself using a hand-held oxygen-jet gun, nicknamed the 'zip gun,' that expelled pressurized gas to push him around outside the capsule. The extravehicular activity started over the Pacific Ocean near Hawaii and lasted 23 minutes before ending over the Gulf of Mexico. Gemini 4 as a whole lasted just under four days and 62 orbits, a length NASA chose specifically to approach the endurance record the Soviets had already set.
Why it matters
Leonov's Soviet spacewalk three months earlier had again put the US behind; White's walk showed NASA closing the gap in a capability every Apollo lunar mission would eventually depend on, since astronauts had to exit their spacecraft on the Moon's surface using the same basic life-support and mobility principles tested here.
How we know
NASA's own mission overview page for Gemini IV documents the timing, tether length, and propulsion method from mission records; a separate NASA history office article on the flight independently corroborates the same duration and technical details.
Sources
- NASA. Gemini IV · Primary source (author-declared)nasa.gov · Cited as a "primary" source (no stronger domain match). · Link is live and its text matches the event's key terms (Jul 2026)
- NASA History Office. Gemini IV: Learning to Walk in Space · Primary source (author-declared)nasa.gov · Cited as a "primary" source (no stronger domain match). · Link is live and its text matches the event's key terms (Jul 2026)
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