NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
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Portrait of the four remaining Mercury 7 astronauts after Alan Shepard's memorial service in 1998. Left to right are: John Glenn, Walter Schirra, Gordon Cooper and Scott Carpenter. This group of astronauts, along with Alan Shepard, Virgil Grissom, and Donald Slayton, were known as the Original Seven and Astronaut Group 1. They are the only group of astronauts to have flown on all of NASA's manned spacecraft in the 20th century.
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