an end with the tragic loss of the Challenger (STS-51-L) on January 28, 1986, taking with it seven astronauts, including Christa McAuliffe, who was to have been the first teacher in space. In full view of the world, a faulty O-ring on the right solid rocket booster allowed hot gases to burn through the external fuel tank and cause it to explode, destroying the shuttle in the process. Extensive efforts were made to improve NASA's increasingly careless management practices, and to make the shuttle safer. Flights resumed with the launch of Discovery in September 1988. The Soviet program with cosmonauts went well during the decade, experiencing only minor setbacks. The Salyut 6 space station, launched in 1977, was replaced by Salyut 7 in 1982. Then came Mir in 1986, which ended up operating for more than a decade, and was destined to be the last in the line of Soviet space stations that had begun in 1971. One of the Soviet Union's last "superprojects" was the Buran space shuttle; it was only used once, in 1988. Automobiles The American auto industry began in the 1980s in a thoroughly grim situation, faced with poor quality control, rising import competition, and a severe economic downturn. Chrysler and American Motors (AMC) were near bankruptcy, and Ford was little better off. Only GM continued with business as usual. But the auto makers recovered with the economy by 1983, and in 1985 auto sales in the United States hit a new record. However, the Japanese were now a major presence, and would begin manufacturing cars in the US to get around tariffs. In 1986, Hyundai became the first Korean auto maker to enter the American market. In the same year, the Yugoslavian-built Yugo was brought to the US, but the car was so small and cheap, that it became the subject of jokes. It was sold up to 1991, when economic sanctions against Yugoslavia forced its withdrawal from the American market. As the decade progressed, cars became smaller and more efficient in design. In 1983, Ford design teams began to incorporate aerodynamic styling to decrease drag while in motion. The Thunderbird was one of the first cars to receive these design changes. In 1985, Ford released the Taurus with a design that was revolutionary among domestic mass market automobiles. General Motors began suffering significant losses in the late 1980s, partially the result of chairman Roger