Wouldn't really help to test it in space unless you can do a better job in space of controlling error than on the Earth. It seems unlikely you'd be able to cont

Wouldn't really help to test it in space unless you can do a better job in space of controlling error than on the Earth. It seems unlikely you'd be able to control for error better when you don't even have physical access to the experiment item. There are myriad of forces acting on objects in orbit, even interplanetary. Remember the Pioneer anomaly?