Discovery's flight is the third orbiter mission of 2008 and the first to fly the "in-line" external fuel tank.
The new fuel tank has been built from the ground up with the upgrades demanded after the Columbia disaster in 2003.
The improvements are designed to minimise the shedding of insulation foam on launch - the problem that doomed Columbia and her crew.
http://news.bbc.co.uk/1/hi/sci/tech/7429655.stm
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