But Armstrong, 78, is said to disagree with his former Nasa colleague. “He does not really feel the same way about some of these current policy issues that Aldrin does, and here’s Buzz out there hawking his book and being the one that everyone’s interviewing,” Armstrong’s friend and biographer James Hansen told The Times.

“Buzz is suggesting that we need to skip over going back to the Moon and start moving towards Mars, and the Nasa position has been somewhat different to that. I think Neil really believes that the Moon is very important — not that he doesn’t want to go on to Mars, but maybe that going back to the Moon is the right thing to do first, and then use the Moon as a staging post for a Mars mission.”