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black hole at center of galaxy

At New Scientist: Astronomers question if the first picture of a black hole is accurate – Rob Sheldon comments

Rob Sheldon: In fact, the only thing going for the original "ring" picture, was that it matched expectations. Which is another way of saying, it was a circular logic reconstruction. My claim is that this is too often true of numerous "scientific discoveries", where we use computer models to help perform the reconstruction. This is true of "gravitational waves", it is true of "global climate models" it is true of "evolutionary trees", it is true of "tree ring dendochronology". We have been deceived by the ease with which computer models can simulate real data, and as my retired nuclear engineer friend would say, "How do we know when our computer model is done? When we get the answer we want." Read More ›