Muddy Pu education Yicen

Muddy Pu education Yicen
Challenger space shuttle, the U.S. official use of the second space shuttle. Early development was originally used as a high realistic structure of the test body (high-fidelity Structural Test Article, so the initial body codenamed STA-099), but after the completion of the initial irst test Challenger mission, was converted into a formal track vehicles (Orbiter Vehicle, so the code to OV-099), and on April 4, 1983 a formal inaugural mission. However, unfortunately, the Challenger in January 28, 1986 for the first 10 space mission codenamed STS-51-L, as a right of the solid rocket boosters above O-ring failure, leading irst to a series of chain reactions , and 73 seconds after liftoff, explosive disintegration of the crash. Seven astronauts killed in the whole machine on the second accident.
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