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An astronaut, cosmonaut , spationaut or taikonaut is a person who travels into space, or who makes a career of doing so. The criteria for determining who has achieved human spaceflight vary (see edge of space). In the United States, people who travel above an altitude of 50 miles (approximately 80 kilometers) are designated as astronauts. The FAI defines spaceflight as over 100 km (approximately 62 miles). As of October 12, 2005, a total of 448 humans have reached space according to the U.S. definition, 442 people qualify under the FAI definition, while 438 people have reached Earth orbit or ......read all related info... |
