1969 in spaceflight 1969 in spaceflight 1969 saw humanity step onto another world for the first time. On 21 July 1969, the Apollo 11 Lunar Module, "Eagle," landed on the moon's surface with two astronauts aboard. Days later the crew of three returned safely to Earth, satisfying U.S. President John F. Kennedy's 1962 challenge of 25 May 1961, that "this nation should commit itself to achieving the goal, before this decade is out, of landing a man on the Moon and returning him safely to the Earth." There were four Apollo missions in total in 1969, three of which traveled to the moon,
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