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space walkers
Category :- sude Author :- vishnu namboothiri 
Posted on September 11, 2017, 5:27 am

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The criteria for what constitutes human spaceflight vary. The Fédération Aéronautique Internationale (FAI) Sporting Code for astronautics recognizes only flights that exceed an altitude of 100 kilometers (62 mi).[4] In the United States, professional, military, and commercial astronauts who travel above an altitude of 50 miles (80 km)[5] are awarded astronaut wings.

As of 17 November 2016, a total of 552 people from 36 countries have reached 100 km (62 mi) or more in altitude, of which 549 reachedlow Earth orbit or beyond.[6] Of these, 24 people have traveled beyond low Earth orbit, to either lunar orbit, the lunar surface, or in one case a loop around the Moon;[7] three of the 24 did so twice: Jim LovellJohn Young and Eugene Cernan.[8] The three astronauts who have not reached low Earth orbit are spaceplane pilots Joe WalkerMike Melvill, and Brian Binnie.

As of 17 November 2016, under the U.S. definition 558 people qualify as having reached space, above 50 miles (80 km) altitude. Of eightX-15 pilots who exceeded 50 miles (80 km) in altitude, only one exceeded 100 kilometers (about 62 miles).[6] Space travelers have spent over 41,790 man-days (114.5 man-years) in space, including over 100 astronaut-days of spacewalks.[9][10] As of 2016, the man with the longest cumulative time in space is Gennady Padalka, who has spent 879 days in space.[11] Peggy A. Whitson holds the record for the most time in space by a woman, 377 days.[12]

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