A preauthorization is not a guarantee of benefits or payment. Predetermination. is a voluntary, written request for review of. treatment or services and includes services that may be considered. not medically necessary; investigational, experimental or unproven; or.
The Mercury Project suffered some early setbacks, however, and on April 12, 1961, Soviet cosmonaut Yuri Gagarin orbited Earth in the worldâs first manned space flight. Less than one month later, on May 5, astronaut Alan Shepard was successfully launched into space on a suborbital flight. On February 20, 1962, in a major step for the U.S. space program, John Glenn became the first American to orbit Earth.
ESA astronauts. The first European astronaut flew in space in 1983 and the European Astronaut Centre in Cologne has been training men and women for missions since 1998. The first European to serve a tour of duty on the International Space Station was Umberto Guidoni who visited the Station in April 2001.