The Mercury Seven: How America Picked Its First Astronauts in 1959

The Space Race · April 9, 1959

The Mercury Seven, NASA's first astronaut group, photographed in pressure suits in 1960

The Mercury Seven, NASA's first astronaut group, photographed in pressure suits in 1960 · NASA photograph, public domain (PD-USGov-NASA), via Wikimedia Commons

They were introduced at a press conference in Washington on April 9, 1959, and the country decided on the spot that it liked them: seven military test pilots, all married, all fathers, all photographed in silver pressure suits that had barely been invented. Nobody in the room had been to space. Nobody on Earth had.

The selection had been narrowed from 508 service records to 110 candidates to 32 who reported for testing, and the testing was famously strange — ice water in the ear canal, isolation chambers, treadmills tilted until the heart gave up an answer. What NASA was really looking for was not strength but tolerance: men who stayed calm while something unfamiliar happened to their bodies.

The seven were Scott Carpenter, Gordon Cooper, John Glenn, Gus Grissom, Wally Schirra, Alan Shepard and Deke Slayton. Six of them would fly a Mercury capsule; Slayton was grounded by a heart murmur and waited sixteen years for his flight. If you were a boy in the early 1960s, these were the faces on the classroom wall.

On the record

  • Announced April 9, 1959 at NASA headquarters in Washington, D.C.
  • All seven were military test pilots — the requirement was set by President Eisenhower to narrow an unmanageable field.
  • Deke Slayton was grounded in 1962 for an irregular heartbeat and finally flew in 1975 on Apollo-Soyuz.
  • Alan Shepard flew first, on May 5, 1961 — a fifteen-minute suborbital hop, three weeks after Gagarin orbited.

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Sources: NASA — Project Mercury Overview · Image file at Wikimedia Commons.

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