Space History

Gemini Astronauts: All 16 Crew Members and Their Missions

By 10 Mins Read

TLDR

Sixteen astronauts flew NASA’s Project Gemini. There were ten crewed missions, Gemini 3 through Gemini 12, flown between March 1965 and November 1966, with two astronauts per flight. Four men flew twice: John Young, Pete Conrad, Tom Stafford and Jim Lovell. Gemini 1 and 2 had no crew. Six of the sixteen later walked on the Moon.

Contents

The Gemini astronauts at a glance

Project Gemini was the bridge between Mercury’s single-seat capsules and Apollo’s trip to the Moon. Its job was to teach NASA the skills Apollo would need: long flights, rendezvous, docking and working outside the spacecraft. The astronauts came from three selection groups. The Mercury Seven supplied Grissom, Cooper and Schirra. The “New Nine,” picked in 1962, supplied Armstrong, Borman, Conrad, Lovell, McDivitt, Stafford, White and Young. The “Next Fourteen,” picked in 1963, supplied Aldrin, Cernan, Collins, Gordon and Scott.

Here is every crew in the order the missions actually flew. Gemini 6A launched after Gemini 7, which is why the numbers look out of sequence.

Mission Command pilot Pilot Dates Headline achievement
Gemini 3 Gus Grissom John Young Mar 23, 1965 First crewed Gemini flight; first orbit change by a U.S. crew
Gemini 4 James McDivitt Ed White Jun 3-7, 1965 First U.S. spacewalk
Gemini 5 Gordon Cooper Pete Conrad Aug 21-29, 1965 Eight days in orbit
Gemini 7 Frank Borman Jim Lovell Dec 4-18, 1965 Fourteen days in orbit; target for Gemini 6A
Gemini 6A Wally Schirra Tom Stafford Dec 15-16, 1965 First crewed rendezvous in space
Gemini 8 Neil Armstrong David Scott Mar 16, 1966 First docking; first in-orbit emergency
Gemini 9A Tom Stafford Gene Cernan Jun 3-6, 1966 Cernan’s two-hour spacewalk
Gemini 10 John Young Michael Collins Jul 18-21, 1966 Two rendezvous, two spacewalks
Gemini 11 Pete Conrad Richard Gordon Sep 12-15, 1966 Docking on the first orbit; record altitude
Gemini 12 Jim Lovell Buzz Aldrin Nov 11-15, 1966 Three spacewalks; spacewalking finally worked
Wide angle of space station during liftoff of rocket after countdown against cloudy sky

Gemini 3: Grissom, Young and the sandwich

Gus Grissom became the first person to fly in space twice. His crewmate John Young was a rookie. They launched on March 23, 1965, flew three orbits in under five hours, and fired their thrusters to change the shape of their orbit, a first for any American crew.

Grissom had nicknamed the capsule “Molly Brown,” a pointed joke about his Mercury capsule, which sank after splashdown. The part people remember, though, is the corned beef sandwich. Young had smuggled it aboard in a pocket. Grissom took a bite, crumbs floated around the cabin, and both men decided it was a bad idea to keep going with it near the instruments. Congress, which was paying for the program, took the stunt less lightly than the crew did.

Gemini 4: McDivitt and White

James McDivitt commanded, and Ed White floated out of the hatch on June 3, 1965, for the first American spacewalk. He was outside for roughly 20 minutes, steering with a handheld gas gun, tethered by a gold-plated umbilical. When mission control told him to come in, White replied that it was the saddest moment of his life.

Getting back in was harder than getting out. The hatch fought them. The flight also lasted four days, a long step past Gemini 3’s five hours.

Astronaut conducting a spacewalk with Earth in the background, showcasing outer space exploration.

Gemini 5: Cooper and Conrad

Gordon Cooper and Pete Conrad flew eight days, enough to beat the Soviet endurance record. A fuel cell pressure problem nearly ended it early, and the crew spent much of the flight conserving power and drifting. They also had to cancel the planned rendezvous with a pod released from the capsule.

The mission is easy to skip, but it mattered. Eight days was the length of a round trip to the Moon, and Gemini 5 showed a crew could live that long in a cabin the size of a car’s front seat.

Gemini 7 and 6A: Borman, Lovell, Schirra and Stafford

These two flights belong together. Frank Borman and Jim Lovell launched first, on December 4, 1965, for a fourteen-day flight, a record that stood until 1970. They flew with their spacesuits partly off, taking turns, and Borman later called it one of the most uncomfortable things he had ever done.

Wally Schirra and Tom Stafford were supposed to dock with an Agena target rocket. The Agena exploded on its way up in October 1965, so NASA rewrote the plan: launch Gemini 6A and rendezvous with Gemini 7 instead. The first attempt on December 12 ended with the engines lighting and shutting down on the pad. Schirra didn’t pull the ejection handle, which saved the mission. Three days later they launched, and the two spacecraft closed to about one foot (30 cm) of each other. Over the radio they pretended to see a UFO and played “Jingle Bells” on a harmonica and bells.

Gemini 8: Armstrong and Scott

Neil Armstrong and David Scott launched on March 16, 1966, and completed the first docking of two spacecraft in orbit about six and a half hours later. Then a stuck thruster on their own spacecraft began to spin the linked pair. Armstrong undocked, which made the spin worse, until the capsule was rolling about once per second and the crew was close to blacking out.

Armstrong shut off the main thrusters and used the re-entry control system to stop the spin. Flight rules required a landing as soon as those thrusters were used, so the crew splashed down in the Pacific in under eleven hours. Scott never got his planned spacewalk. Armstrong’s handling of the emergency is still the textbook example of a pilot saving a spacecraft.

Gemini 9A: Stafford and Cernan

Gemini 9 was supposed to fly Elliot See and Charles Bassett. After they died, Tom Stafford and Gene Cernan moved up from the backup crew. Their mission was rough from the start. The Agena target was lost in a launch failure, and the backup target vehicle arrived with its protective shroud only half open. Stafford and Cernan nicknamed it the “angry alligator” and couldn’t dock.

Cernan’s spacewalk was the real trial. He spent about two hours outside on June 5, 1966, and had nothing to hold on to. Every push at a task sent him tumbling. His visor fogged over, his heart rate climbed past 180, and he came back inside soaked in sweat and unable to complete his backpack test. The lesson went straight to the next missions: spacewalking needed handholds, foot restraints and better cooling.

The landing, at least, was good. The capsule came down less than a mile from the recovery ship USS Wasp.

A SpaceX Dragon capsule orbited against the dark vastness of outer space.

Gemini 10: Young and Collins

John Young’s second flight came sixteen months after his first, this time as commander with rookie Michael Collins. They docked with their own Agena and used its engine to climb to a higher orbit, then chased down the old Agena left from Gemini 8.

Collins did two spacewalks. In the second he left the capsule and pulled himself across to the dormant Agena to retrieve a micrometeoroid experiment, free-floating on his tether. He also lost a camera to space.

Gemini 11: Conrad and Gordon

Pete Conrad and Richard Gordon docked with their Agena on the first orbit, about 94 minutes after launch, a test of the rendezvous approach Apollo would use at the Moon. They then fired the Agena’s engine to reach an altitude of roughly 850 miles (1,370 km), the highest any crewed spacecraft went until 2024.

Gordon’s spacewalk went badly in a useful way. He tried to tether the capsule to the Agena, wrapped his legs around the Agena like a rider on a horse, and wore himself out. Sweat ran into his eyes and the spacewalk was cut short. Conrad also flew the first fully automatic re-entry.

Gemini 12: Lovell and Aldrin

The last Gemini flight fixed spacewalking. Buzz Aldrin’s doctoral thesis at MIT was on orbital rendezvous, and he treated spacewalking as an engineering problem. Before the flight he trained underwater to practice working in neutral buoyancy, a method NASA still uses.

In orbit, Aldrin added handrails and foot restraints to his routine and completed three spacewalks totaling more than five hours, with a heart rate that stayed calm. When the rendezvous radar failed, he also worked out the rendezvous with a sextant and charts. NASA’s records for the mission list it as the tenth and final crewed Gemini flight. Lovell and Aldrin splashed down on November 15, 1966.

The crew that never flew: See and Bassett

Gemini 9’s original crew was Elliot See and Charles Bassett. On February 28, 1966, they flew a T-38 jet to the McDonnell plant in St. Louis to train on the simulator. Bad weather hid the runway. The jet hit the roof of the building that held their Gemini spacecraft, killing both men. Stafford and Cernan, the backups, flew the mission instead.

Backup crews are the least-covered part of the Gemini story, but the system mattered. Every prime crew had a backup trained to take over, and the backups often ended up commanding Apollo missions.

Where the Gemini astronauts went next

Gemini was a proving ground, and most of the sixteen went on to Apollo.

  • Walked on the Moon (six): Neil Armstrong and Buzz Aldrin (Apollo 11), Pete Conrad (Apollo 12), David Scott (Apollo 15), John Young (Apollo 16) and Gene Cernan (Apollo 17). Six of the twelve people who have walked on the Moon flew Gemini first.
  • Circled the Moon: Frank Borman and Jim Lovell on Apollo 8. Lovell later commanded Apollo 13, the mission that never landed.
  • Flew Apollo in Earth or lunar orbit: Tom Stafford commanded Apollo 10, and Cernan and Young flew on it. Wally Schirra commanded Apollo 7. James McDivitt commanded Apollo 9. Michael Collins flew the command module on Apollo 11 and Richard Gordon on Apollo 12.
  • Died in the Apollo 1 fire: Gus Grissom and Ed White, along with Roger Chaffee, on January 27, 1967, during a launch rehearsal.
  • Never flew again: Gordon Cooper, who had flown Mercury 9 in 1963 and Gemini 5.

For the full account of the program, NASA’s history series on Gemini is free to read online.

Where are they now?

Most of the Gemini astronauts have died. As of August 2025, only David Scott and Buzz Aldrin were still living. Jim Lovell died that month, and Tom Stafford and Frank Borman died in 2024 and 2023. Gordon Cooper, Pete Conrad, Wally Schirra, Neil Armstrong, Gene Cernan, Richard Gordon, John Young, Michael Collins and James McDivitt also died before them. Grissom and White died in 1967.

A creative diorama depicting the moon landing with astronauts and flag in a studio setup.

FAQ

How many astronauts flew on Project Gemini?

Sixteen. Ten crewed missions carried two people each, so twenty seats were filled by sixteen men, because four of them flew twice.

Which Gemini astronauts flew twice?

John Young (Gemini 3 and 10), Pete Conrad (Gemini 5 and 11), Tom Stafford (Gemini 6A and 9A) and Jim Lovell (Gemini 7 and 12).

Which Gemini astronauts walked on the Moon?

Neil Armstrong, Buzz Aldrin, Pete Conrad, David Scott, John Young and Gene Cernan.

Who did the first American spacewalk?

Ed White, on Gemini 4, on June 3, 1965.

Why was Gemini 6A launched after Gemini 7?

Gemini 6 was meant to dock with an Agena rocket that exploded in October 1965. NASA relaunched the mission as 6A to rendezvous with Gemini 7, which was already in orbit.

Are any Gemini astronauts still alive?

As of August 2025, David Scott and Buzz Aldrin were the only two.

Related Posts