History of spaceflight out by NASA. The programs goal was to orbit and land manned vehicles on the moon. The program ran from 1969 to 1972. Apollo 8 was the first manned spaceflight to leave earth orbit and orbit the Earth's moon on December 21, 1968. Neil Armstrong and Buzz Aldrin became the first men to set foot on the moon during the Apollo 11 mission on July 20, 1969. The Skylab programs goal was to create the first space station of NASA. The program marked the last launch of the Saturn V rocket on May 19, 1973. Many experiments were performed on
Effect of spaceflight on the human body Effect of spaceflight on the human body Venturing into the environment of space can have negative effects on the human body. Significant adverse effects of long-term weightlessness include muscle atrophy and deterioration of the skeleton (spaceflight osteopenia). Other significant effects include a slowing of cardiovascular system functions, decreased production of red blood cells, balance disorders, eyesight disorders and a weakening of the immune system. Additional symptoms include fluid redistribution (causing the "moon-face" appearance typical in pictures of astronauts experiencing weightlessness), loss of body mass, nasal congestion, sleep disturbance, and excess flatulence. The engineering problems associated with leaving Earth and developing