https://www.scientificamerican.com/article/the-milky-ways-central-black-hole-is-a-hot-spot-for-astrophysics/

The discovery of  wobbling “hotspots” circling the drain of a massive black hole offers exciting new evidence for the behemoth that lies at our galaxy’s center—and the study leader shares how 13 years of observations have finally paid off.

The new study, led by Avery Broderick, an astronomer from the University of Waterloo in Ontario, Canada, revealed three flares, or visual hotspots, emanating from the Milky Way’s central black hole, also known as Sagittarius A*.