Echoes of Apollo of the Moon's surface: The next "World Moon Bounce Day" was scheduled for the month preceding Apollo 13's 40th anniversary in March or April 2010. Echoes of Apollo also provide a news clipping service for space news. Its main focus is on space missions, but also contains interesting astronomy news, especially when associated with radio telescopes. It is updated regularly during the week and can be viewed at: . The website provides significant information about the Apollo program and the communications network that supported the program. (http://www.wia.org.au/members/armag/2009/august/) Echoes of Apollo Echoes of Apollo is an international organisation formed in January
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