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Originally Posted by mrnoodle
Being completely unable to physically test something means that you can come up with whatever imaginary objects/forces that you want, assign them a relationship based on what you want to see happen, and call it a day.
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You don't have to physically test things to prove that they are as you expect. We have a pretty good idea of the chemical composition of our sun even though we have never taken samples from the surface. We can study the color of the light it gives off, and using spectroscopy we know that it's mostly hydrogen. That's just one example, but there are many more.