History: NASA Archive Photography

- Apollo program (1961–1972, manned missions from 1968)
The Apollo (Moon) program was one of the most expensive American scientific programs ever. It is estimated to have cost $202 billion in present day US$. In comparison the Manhattan (atom bomb) project cost roughly today-US$25.8 billion. It used the Saturn rockets as launch vehicles, which were far bigger than the rockets build for previous projects. The spacecraft was also bigger as can be seen on the picture; it had two main parts: the combined command and service module (CSM) and the lunar landing module (LM). The LM was to be left on the Moon and only the command module (CM) containing the astronauts would eventually return to Earth.
The second manned mission, Apollo 8, brought astronauts for the first time in a flight around the Moon. This happened in December 1968. Shortly before, the Soviet had sent an unmanned spacecraft around the Moon but they never managed to do more than that. On the next two missions docking maneuvers that were needed for the Moon landing were practiced and then finally the Moon landing was made on the Apollo 11 mission in July 1969. In 1961 President Kennedy had introduced the Apollo Program and set the deadline for a successful Moon landing at the end of the same decade. It was done by a narrow margin.
The first person to stand on the Moon was Neil Armstrong and after him Buzz Aldrin while Michael Collins orbited above. Five subsequent Apollo missions also landed astronauts on the Moon, the last in December 1972. In these six Apollo spaceflights twelve men walked on the Moon. These missions returned a wealth of scientific data and 381.7 kilograms (842 lb) of lunar samples. Experiments included soil mechanics, meteoroids, seismic, heat flow, lunar ranging, magnetic fields, and solar wind experiments. The Moon landing marked the end of the space race and as a gesture, Armstrong mentioned mankind when he stepped down on the Moon.