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  1. 8 hours ago · Countries (and successor states) whose citizens have flown in space as of January 2024. The criteria for determining who has achieved human spaceflight vary. The Fédération Aéronautique Internationale (FAI) defines spaceflight as any flight over 100 kilometres (62 mi), while in the United States, professional, military and commercial astronauts who travel above an altitude of 50 miles (80 km) are awarded astronaut wings.

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