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Up until a beautiful May evening in 2019 at Hawaii’s Keck Observatory, Sagittarius A (Sgr A ), the Milky Way’s central supermassive black hole was usually a passive flickering object that appeared like a massive, dormant volcano or a sleeping monster. But suddenly Sgr A , located twenty-five thousand light years from Earth, brightened 75-fold. “The black hole is always variable,” observed astronomer Tuan Do, “but this was the brightest we’ve seen in the infrared so far. It was probably even brighter before we started observing that night!”
“The black hole was so bright I at first mistook it for the star S0-2, because I had never seen Sgr A that bright,” Do said in an interview with ScienceAlert.