http://uk.businessinsider.com/moon-missions-why-astronauts-have-not-returned-2018-7
Citando:
"The last time a person visited the moon was in December 1972, during NASA's Apollo 17 mission.
Over the decades, NASA has planned to send people back to the moon but has yet to succeed.
Astronauts often say the biggest reasons humans haven't returned to the lunar surface are budgetary and political hurdles, not scientific or technical challenges.
Private companies like Blue Originand SpaceX may be the first entities to return people to the moon."
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