Goa, March 18 -- Sunita Williams and Butch Wilmore, experienced NASA astronauts who have spent the last nine months aboard the International Space Station, are finally on their way back to Earth, marking the conclusion of a unique mission. Following the arrival of a replacement crew on Saturday night, Wilmore, Williams, and two other astronauts are set to undock from the ISS at 1:05 am ET (0505 GMT) on Tuesday, starting a 17-hour journey home. NASA has advised the astronauts to take this time to rest, enjoy some meals, and prepare for their splashdown.

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