I read in the paper recently that NASA have proved that Einstein's theory on Gravity is correct. NASA did this with the Gravity Probe B mission that probably cost several hundred million dollars to fund, apparently they proved the theory correct by making a machine containing perfectly round balls that somehow proved that allignment of planets shifted slightly over time, what i want to know is was it worth it? couldnt they of done the same thing from earth? and how does it help with anything they dont already know? to me all it has done is just re-iterate what a genius Einstein was ! but then i dont know much about this stuff   More