One good thing with special and general relativity is that if there is even one observation that violates the speed of light barrier, everything about the theory of relativity collapses instantly and everything must be discarded due to logical flaw in the axioms of theory. (Perhaps this was the reason why they were reluctant to give Nobel prize from relativity.)
I myself have predicted that speed of light will get higher value when measured from the orbit of Venus than here on Earth. And I have bet €100 about the subject. Funny thing about the tests considering SP is that speed of light has been always measured in respect for moving light source but it has never been measured that when the speed of the observer is changing. Delta-v would be too small in Earth's low orbit but in Venus' orbit relativistic effect should be observable and easily measurable. —Jouni
