The Time Machine. Haven’t read it, saw the movie.
Hmm I wonder if TheBadAstronomer will do a vanity search and find this thread
Arthur Clarke wrote The Time Machine?
What a multi talented bloke he is.
strangely enough I can’t think of a real book, as opposed to film, in which the moon did impact the Earth spontaneously except R.C.Sherriff’s The Cataclysm…
and that is pretty obscure nowadays.
Sci-fi worldbuilding at
http://www.orionsarm.com/main.html