Some critics of space exploration programs claim that they are too costly to be justified  Moreover, there is the very real risk of a debilitating explosion -- most experts say something like a 1-in-70 chance per flight
Budgetary pressures to make the programs cheaper only serve to undermine safety: one program' s managers uncovered a series of manufacturing flaws that critics contend are a direct consequence of the pressure to produce results as quickly and cheaply as possible
Safety risks are sometimes ignored in the name of scientific progress.