Gus Grissom.
Project Gemini and Project Apollo had astronauts practice piloting and working in space.
Project Mercury.
Only seven people were chosen for the Mercury program. Six out of the seven astronauts chosen had a Mercury flight. Deke Slayton was grounded because he had a heart problem (a heart murmur to be exact). He was able to fly as part of the Apollo-Soyuz Test Project. here are the seven mermbers of the Mercury program: Alan Shepard jr. Gus Grissom John Glenn Jr. Scott Carpenter Walter Schirra jr. Gordon Cooper jr. Deke Slayton
Of the seven military test pilots selected as astronauts selected for Project Mercury, only six actually flew Mercury missions: Shepard, Grissom, Glenn, Carpenter, Schirra and Cooper. Slayton was medically grounded in 1962 and replaced by Carpenter, but eventually flew on the last pre-Shuttle mission, the Apollo-Soyuz Tesp Project, in 1975.
As each Apollo spacecraft had three astronauts at a time and seven Apollo crafts flew to the moon, there were a total of 21 astronauts.
Project Mercury. Only seven astronauts were chosen for this. They're called " The original seven " because they were the first astronauts.
The first astronauts were called the Mercury 7 because they were the first group of astronauts selected for Project Mercury, the United States' first manned spaceflight program. The "7" refers to the seven original astronauts chosen by NASA.
Project Gimini
The first seven astronauts in the United States were part of the Mercury program. They are:Alan Shepard jr.Virgil (Gus) GrissomJohn Glenn jr.Walter Schirra jr.M. Scott CarpenterDonald "Deke" SlaytonL. Gordon Cooper jr.
Alan Shepard
The NASA project following Project Mercury was called Project Gemini. It served as a bridge between Mercury and Apollo, testing new technologies and techniques needed for the later moon-landing missions.
Astronauts during the Mercury project ate freeze-dried food, such as chicken stew and beef pot roast, that was rehydrated with water. They also consumed bite-sized cubes of food wrapped in edible gelatin coating to prevent crumbs in the spacecraft.
They were put through a lot of tests and practiced being weightless
One problem with Project Mercury was the spacesuit. It was very heavy and needed to be redesigned several times. Another problem that Project Mercury faced was designing a way to bring back the astronauts without them overheating on re-entry. There were also tragedies to overcome when a test failed and astronauts died.
Project Mercury sent the first 6 Americans into space. They were all solo flights.
7 astrounets u see they were picked for this part they were very lucky guys
Deke Slayton was a member of the Mercury Seven astronauts but did not fly in the Mercury program due to a medical condition. He eventually flew in the Apollo-Soyuz Test Project mission as part of the U.S. crew, establishing cooperation between the United States and the Soviet Union in space.