Post #4103 1.33K Jun 21, 2023, 22:17 UTC Detection of an echo emitted by Sagittarius A* 200 years agoArticle@EverythingScience phys.org Detection of an echo emitted by Sagittarius A* 200 years ago An international team of scientists has discovered that Sagittarius A* (Sgr A*), the supermassive black hole at the center of the Milky Way, emerged from a long period of dormancy some 200 years ago. 👍 4 ❤ 1 🔥 1 🤯 1