http://news.bbc.co.uk/2/hi/science/nature/7590449.stm
Un extrait :
In April, Dr Griffin told a Senate sub-committee: "The shuttle is an inherently risky design. We currently assess the per-mission risk as about one in 75 of having a fatal accident.
"If one were to do, as some have suggested, fly the shuttle for an additional five years - say two missions a year - the risk would be about one in 12 that we would lose another crew."
Personnellement je trouve ces valeurs extrèmement hautes, pas vous ?