Aˈpollo ˌProgram BrE AmE
the US government space programme to send people to the Moon, which succeeded in 1969 when the Apollo 11 spacecraft landed on the Moon. Apollo 13 was a later unsuccessful attempt to land on the Moon again, and the words one of the ↑ astronaut s used when he thought something was going wrong, ‘Houston, we have a problem’, are sometimes now used in a humorous way. ⇨ NEIL ARMSTRONG , ↑ Gemini Program , ↑ Houston , ↑ Mercury program