Space traveler categories diagram. The astronomical symbol for Earth is in the centre shaded green, surrounded by a blue shaded circle representing the atmosphere below 80 kilometres. The encircling white region labeled 80-100 kilometres represents the altitude range eligible for astronaut wings in the 1960s. The encircling region labeled &gt;100 kilometres and all further regions represent space as defined by the Fédération Aéronautique Internationale (FAI). The dashed circle with arrow represents Earth orbit. Space travelers may be either astronauts or non-astronauts. Not all astronauts are space travelers.
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