How A Satellite Can Prove Einstein's Theory Of Relativity
When rockets misfire their payloads, scientists use the misplaced satellites to prove the Theory of Relativity. How do they do it?
Wayward satellites repurposed to test general relativity (Nature)
"Two satellites that were accidentally launched into the wrong orbit will be repurposed to make the most stringent test to date of a prediction made by Albert Einstein's general theory of relativity - that clocks run more slowly the closer they are to heavy objects."
What is relativity? (How Stuff Works)
"Einstein proposed the theory of special relativity, which boils down to this: The laws of physics are the same in all inertial frames, and the speed of light is the same for all observers."