The Stones, a family of "Loonies" (residents of the Moon), buy a used spaceship (which by this time is less complicated than a car), overhaul it, and go sightseeing around the solar system.
The twin teenage boys, Castor and Pollux, buy used bicycles to sell on Mars, their first stop. They run afoul of import regulations and are bailed out by their feisty, colorful grandmother, Hazel. While on the planet, the twins buy their kid brother Buster a flat cat. Born pregnant and producing a soothing vibration (compare to the story "Pigs is Pigs" and Star Trek's later tribbles), the endearing creature makes more trouble (and more money) than anyone would have thought possible.
The twins talk their father into taking a detour to the Asteroid Belt, where the future equivalent of a gold rush is in progress; instead of gold, the miners are prospecting for radioactive ores. The boys cannily load up on supplies and luxury goods, since history has shown that shopkeepers are much more likely to get rich than miners. On the trip, the flat cat gives birth, its children do the same, and before they know it, the Stones are knee deep in purring Martians, all happily eating the food they were going to sell. They finally put the creatures in a low-temperature hold to get them to hibernate. Once they reach the asteroids, they are pleasantly surprised to discover that the lonely miners are willing to pay for the Stones' unwanted pets. Then Buster and Hazel get lost, and Hazel almost dies before they are rescued by the twins.
At the end, they decide to indulge their wanderlust further by traveling to Saturn to see the rings.
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