Apollo 15 postal covers incident in the moon landings, the public's fascination with items flown in space increased, as did their value. Although it was not publicly known until September 1972, 15 of the men who entered space as Apollo Program astronauts, before Apollo 15, had agreed with a West German named Horst Eiermann to autograph 500 philatelic items (postcards and blocks of stamps) in exchange for $2,500. This included a member of each mission between Apollo 7 (1968) and Apollo 13 (1970). These items were not taken into space. Covers were prepared by the crews and flown on Apollo 11, Apollo 13 and Apollo
Apollo Applications Program the second stage and enter the now-empty fuel tanks. It was also suggested that the Apollo Telescope and Survey Mission modules might be docked to the Wet Workshop to create a modular space station. The "Planetary Grand Tour" was moved to the Mariner program as "Mariner Jupiter-Saturn", which was later calved off into the Voyager program. Two probes were launched in 1977 on Titan IIIE rockets, with "Voyager 2" completing the full Grand Tour in 1989. Originally, AAP missions would alternate with Apollo lunar missions, starting in 1969. However, when NASA's 1969 budget was cut, focus was shifted to the