Two of the shuttles - Challenger and Columbia - were destroyed, one at launch, the other during the ride home. It cost $196billion over 40 years, ended the lives of 14 astronauts and managed to make less than half the flights promised. Infrasound, also known as low-frequency sound, describes sound waves with a frequency below the lower limit of human audibility. NASA's first space shuttle flight was in April 1981, the last was in July 2011. The space shuttle was sold to America as cheap, safe and reliable.
many millions of dollars were ploughed into extensive investigation of this shuttle over the years.
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many millions of dollars were ploughed into extensive investigation of this shuttle over the years .
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