Regarding your very interesting article on building a base on the Moon (November, p61). The list of Moon facts includes the subject of a letter I wrote to ‘Q&A’ a few months ago. Among other details you state that the Moon is moving away from earth at 3.8cm per year and also that it is 4.53 billion years old. My question, as yet unanswered, was why is it still visible, assuming the movement has been taking place for that immense length of time?
Some creationists claim that the moon could not possibly be more than a few thousand years old, otherwise it would long since have disappeared. Surely there must be some other explanation? The answer is that the rate at which the Moon is moving away from us is increasing over time. So it’s 3.8cm per year now, but it was less in the past. Back then, when it was closer, it felt a stronger gravitational pull from the Earth and so couldn’t flee as fast. –