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FARGO — Astronomers using the massively impressive Event Horizon Telescope, a global network of radio telescopes, have found and made computer imagery of Sagittarius A, the black hole at the center of our Milky Way galaxy. Because the Event Horizon Telescope uses radio waves, it does not "see" in the sense that people see things. Instead, the astronomers have used telemetry from these radio telescopes to measure certain, specific electromagnetic waves to map the object, which can be graphed onto an image generated by a computer.
These images of Sagittarius A amount to an array of radiation surrounding an invisible (black) disc. The black hole is very dynamic, changing noticeably in size over a time scale of a few hours. The next step in this project will be an attempt to generate a movie of the black hole in order to further study its physics, which is vastly different from the rather mundane physics of simple things like weather.
