Word: toroid
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...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 in the neighborhood of the Sun barely eight years after takeoff. Without that passage she would return 2,000 years later, which would be no return...
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