Apollo 13 mission to land on the Moon. The astronauts' mission insignia was sculpted as a medallion depicting "Steeds of Apollo" by Lumen Martin Winter and was struck by the Franklin Mint. The Apollo 13 mission was to explore the Fra Mauro formation, or Fra Mauro highlands, named after the diameter Fra Mauro crater located within it. It is a widespread, hilly selenological area thought to be composed of ejecta from the impact that formed Mare Imbrium. The next Apollo mission, Apollo 14, eventually made a successful flight to Fra Mauro. April 14, 1970 UTC (April 13, 21:07:53 CST) April 15, 1970,
Apollo 21 in orbit. Some people have speculated that tentative plans of an "Apollo 21" might have been made assuming availability of the extra Saturn V that would have left, although by the time NASA resumed planning manned missions using this numbering sequence (defined on April 24, 1967), the dual-Saturn IB plan had been replaced with the single Saturn V. There is no evidence NASA ever planned an eleventh Moon landing mission. Apollo 21 "Apollo 21" is an apocryphal reference to an eleventh manned Moon landing mission of NASA's Apollo program. Apollo contracted for the construction of fifteen Saturn V launch vehicles