I read this book around 95-97, and I'm sure it was older than that.
It was sci fi, the main character was a male who got vertigo while descending to the moon, and met a girl at the moon base. She had a fuzzy little pet.
Later on the heroes become stuck in a magnetic trap, owned by spider like aliens that the hero ponders about because man had evolved in the warm ocean, but these creatures had evolved in cold space.
That's all I remember.