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Ray traced images of Sagittarius A* Ben Prather/EHT Theory Working Group/Chi-Kwan Chan The EHT Collaboration created a flurry of images of Sagittarius A*, using ray tracing, a technique that visualizes the properties of the black hole based on data collected with the radio telescope array and predictions made by Einstein's theory of general relativity. The images shown here were created by UArizona's Chi-kwan Chan.