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(Under the Spell of the Giant Planet) (1964)
On Impos, an Earth-sized moon of the giant planet Herkules, scientific teams are investigating the artifacts of a long-vanished alien civilization. Then an instrument reading shows that Herkules's center of mass does not match its geographical center. In fact, its center of mass seems to be *moving*. Intrigue and peril ensue -- and also a clue to the mystery of Schreckworms.
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