[baumer]

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Whatever its called, the theory is showing that despite the appearance of different truths to different observers if they apply relativity they will get the same answers about the world and so there is only one truth of the matter.

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The following is from The Elegant Universe, by Brian Greene.

"Imagine that George, who is wearing a spacesuit with a small, red flashing light is floating in the absolute darkness of completely space, far away from planets, stars or galaxies. From George's perspective, he is completely stationary, engulfed in the uniform, still blackness of the cosmos. Off in the distance, George catches sight of a tiny, green flashing light that appears to be coming closer and closer. Finally, it gets close enough to see that the light is attached to another space-dweller, Gracie, who is slowly floating by. She waves as she passes, as does George, and she recedes into the distance. This story can be told with equal validity from Gracie's perspective."

So Gracie sees George floating by, and he appears to approach and then recede into the distant cosmos, while she remains "stationary".

More from The Elegant Universe:

"The two stories describe one and the same situation from two distinct but equally valid points of view. Each observer feels stationary and perceives the other as moving. Each perspective is understandable and justifiable. As there is symmetry between the two space-dwellers, there is, on quite fundamental grounds, no way of saying one perspective is "right" and the other "wrong". Each perspective has an equal claim on truth."

So as you can see, there are two conflicting, truthful ways to describe this event.

I want to know how "applying relativity" to this scenario will "get the same answers about the world" and show that "there is only one truth of the matter."