Saggittarius A*, located at the center of our Milky Way galaxy, emits powerful radio waves. It is thought that this place holds a supermassive black hole. Recently, scientist noticed that brightness of this astronomical radio source went 75 times higher than the usual. The flux level is so high that astronomers say that they have never observed such a phenomenon. Astronomer Tuan Do for a moment thought they were seeing a star called SO-2, which is a group of stars that orbit close to black hole. In an interview with ScienceAlert, Do said, “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.
Over the next few frames, though, it was clear the source was variable and had to be the black hole. I knew almost right away there was probably something interesting going on with the black hole.” The possibility for such a high flare could be accounted by some disturbance. The prime candidate could be SO-2; as the close approach of this star might have disturbed the usual material flow into Sgr A* but astronomers are still doubtful of this theory,as SO-2 is not large enough to cause such a disturbance.
Another reason might be a glass cloud. In 2002 such a hydrogen gas cloud was approaching the center and thought to be torn apart soon, though this phenomenon hasn’t happened yet. The possibility is its passage close to the black hole set off a chain of events that caused or contributed to the May 2019 flaring. Apart from this, it could be a result of variable flow of materials into Sgr. A*. Astronomers are studying closely these phenomenons as these could provide more light about Milky Way galaxy, which is still a mystery.