Word: flowstream
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Quinta seems, from terrestrial observations, a promising target, and getting there is half of Lem's fun. The Eurydice is constructed in orbit around a moon of Saturn; its thermonuclear flowstream engines use hydrogen intake as fuel and can achieve a velocity of 99% the speed of light. While the scout ship Hermes, weighing a mere 180,000 tons, is sent off to reconnoiter Quinta, the Eurydice lingers in the vicinity of a black hole. When Hermes returns, the mother ship will execute an "incomprehensible maneuver called 'passage through a retrochronal toroid,' thanks to which she would reappear...
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