Why is it that no 1 can find out what caused the image on the shroud of Turin ?

Ok think about it with all the tecnology we got they stilll can't figure out what caused the image. They say I was caused by some kind of light. You now like a lite when Jesus soul zipped back into his body after he rose again.everything matches up with the Jesus of the bible . And I no there gonna b doubters sayin but they traced the shroud back to only mid evil times. But they now learned that they took a sample of the shroud which had been added on years later to try and fix som damage to it . Ready all this what do you think about the shroud??