The Jupiter Theft by Donald Moffitt $5 Del Rey / Ballantine Books (1977) This is an incredible book where the central concept is an alien society which is using gas giant planets as fuel for interstellar travel. They stop at our solar system to "refill their gas tank" by preparing their process to enlist Jupiter as their fuel for the next leg of their journey. As the aliens approach the solar system, their deceleration from near-light-speed creates an x-ray source noticed by human astronomers. A human space mission intended to study Jupiter goes to investigate. From there, a considerable part of the story is about most of the human crew being treated like zoo animals, how crew factions fight over what to do, and the crew's concerns if the exit of Jupiter from the solar system will harm Earth. Plausibility is stretched by one crew member being treated differently - who just happens to have perfect pitch and is capable of re-programming a conveniently available moog organ to be able to communicate with two aliens. Very interesting cover art by H. R. Van Dongen. . Overall Great Condition, Pages Look Great, Minor Shelf Wear, Binding Tight, Small Area Of Goo On Spine That May Come Off Easily . . . #thejupitertheft #donaldmoffitt #paperbacksciencefiction https://www.instagram.com/p/B7uVZl1gExQ/?igshid=19vhoswe0pzp1