1960s •
Soviet crewed lunar programs – The Soviet Union had been pursuing a crewed lunar flyby mission using
Soyuz 7K-L1 launched aboard
Proton-K and a crewed landing mission using
Soyuz 7K-LOK and
LK Lander launched aboard
N1 rocket. After a series of N1 failures, both of these programs were cancelled in 1970 and 1976 respectively.
1970s •
Canceled Apollo missions – The Apollo program had three more missions lined up until Apollo 20, but the missions beyond Apollo 17, the sixth and final landing mission, were canceled due to budget constraints, change in technical direction and hardware delays. The ambitions shifted towards developing next generation rockets like
Space Shuttle, the space station
Skylab and in exploration programs such as
Grand Tour program.
2000s •
Constellation Program – The Constellation program ran from 2004 to 2010 and would have utilised the
Ares I and
Ares V rockets alongside the
Orion spacecraft and
Altair lunar lander to return astronauts to the Moon by 2020 in preparation for crewed missions to
Mars. It was cancelled in October 2010 by the
Augustine Committee. However, the Orion was spared and finally launched in November 2022 with Constellation and its rockets revised as the
Artemis Program and
Space Launch System.
2010s •
Resource Prospector – Concept by NASA of a rover that would have performed a survey expedition on a polar region of the Moon. It was canceled in April 2018. •
Indo-Russian joint mission – A joint mission between India and Russia for a robotic lander and rover was under development since 2007. Russia was supposed to develop the lander while India would develop an orbiter, a rover and launch the composite. However, with failure of
Fobos-Grunt mission, Russia was unable to provide the lander in time and requested India to accept the delay and risk. The collaboration ended with India repurposing its orbiter towards Mars with its
Mars Orbiter Mission in 2013. India would later go on to develop and launch its
Chandrayaan-2 and
Chandrayaan-3 mission, using an indigenously developed lander.
2020s •
DearMoon was an unrealized tourist mission financed by Japanese entrepreneur
Yusaku Maezawa. Maezawa and six to eight other civilians would have performed a lunar flyby in a
SpaceX Starship. It was cancelled on June 1, 2024. == See also ==