All the astronauts used by N.A.s.A have walked on the surface of the earth.
There were a total of 12 astronauts who set foot on the moon.
Twelve astronauts have traveled to the moon as part of the Apollo missions, with only astronauts from Apollo 11, 12, 14, 15, 16, and 17 setting foot on its surface. Therefore, six astronauts have traveled to the moon but did not walk on its surface.
The question is not clear, there were three astronauts at a time in a Apollo mission , and there were 11 Apollo missions.
3 astronauts on Apollo 13 one of them did not go up but he went up on Apollo 14.
There were a total of 12 astronauts who walked on the moon.
A total of 71 astronauts flew into space on Apollo missions. These astronauts were divided across the 17 Apollo missions that included manned flights.
12
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.
The Apollo capsule took three astronaut's.
Apollo astronauts conducted and deployed many scientific experiments prepared by scientists on earth. For those with an interest in the results, see the related link below. Many soil and rock samples were taken and returned to earth for analysis.
The Apollo 11 crew were in space for 8 days from July 16, 1969 to the 24th of July.
All the three astronauts of Apollo 11 were qualified pilots.