This is a utterly charming story about a kitten adopted by an astronaut. The story was written in 1952, at a level we would now call young adult. It was written before NASA existed, so the astronaut is described as a military pilot, living in the desert at a military base, who flies jets and trains for space flight. The plot is solid science fiction, written before much was known from unmanned spacecraft about other planets. The kitten is a stowaway on the first orbital flight that its owner takes on a rocket, and is distressed by the g-forces. So when the kitten shows his determination to go on the first Moon flight (by repeatedly sneaking onto the rocket), the base engineers construct a pressure suit, complete with helmet and oxygen supplies, for the cat. There is an adorable illustration of the cat chasing droplets of milk in zero gee through the cockpit of the rocket. The space cat discovers sentient creatures living on the Moon, who help the cat to save the human astronaut when he is injured in a rock fall. All this is done while leaving the cat a (very smart) cat, who doesn’t talk and isn’t magic in some other way, and who has cat-like opinions on dogs, tuna, and the merits of meeting politicians. I loved the little songs that the cat makes up, along the lines of “Oh, I’m going to the Moon, purr! purr! In a rocket not a balloon, purr! purr!” This is a wonderful and classic young adult cat story.