Apollo 11 was particularly important because if it had failed, the whole American space programme would have been thrown into chaos, and there would have been strident calls for its total abolition. Moreover, there were still qualms about the stability of the Moon’s surface. The once-popular theory of deep dust-drifts had been disproved, thanks to the unmanned landers, but there could well be unsafe areas here and there, and as Neil Armstrong and Buzz Aldrin came down my main feeling was one of anxiety. If for any reason the landing were faulty, there could be no second change – and there was no provision for rescue. When Neil’s voice was heard saying “The Eagle has landed,” I think my feeling of relief was shared by the whole world. Remember too that the later astronauts had a very good idea of what to expect. Neil and Buzz did not.