Astrophysicist Chi-kwan Chan uses Codex to refine algorithms simulating electron and ion movement around black holes, tackling the challenge of modeling extreme physics. Current algorithms and computing power limit simulation realism, but Codex helps improve these simulations. By better understanding black holes, scientists can test Einstein’s general theory of relativity, which explains gravity as the result of mass and energy bending space and time. This research is significant because it can help us better understand the universe’s most extreme phenomena, and why it matters is that it pushes the boundaries of what we can learn from black holes and the fundamental laws of physics that govern them.