Can somebody tell me when was it decided that light was made of "matter"? I am supposing this assumption based on the concept of "black holes" being capable to "attract" light itself back to its core. I think we do not "see" light from blackholes because wavelenght is shifted to a non-visible frequency due to strong electro/magnetic field within the black hole. So, it is not "attraped" but rather "converted". If light was capable to be "attracted" by black holes, then we would be virtually "blind" from our universe. Imagine the hundreds/thousands of blackholes that beams of distant light would have to pass near by without being "attraped" or at least "deviated". So, we would be able to "see" a totally different universe from what actually "looks like". Manuel.