Question

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Did you know that Russian Cosmonaut Сергей Авдеев ("Sergei Avdeyev") is considered Earth's first significant time traveler?​

Answer 1

During his active years as a cosmonaut (1992-1999), he set a record for cumulative time in space. Across 3 visits to the Mir station, he spent an astonishing 747 days in low Earth orbit! Sergei circled the planet nearly 12 thousand times, traveling a total of 515 million kilometer.