Two articles published in the journal “Astronomy & Astrophysics” report aspects of a research on Sagittarius A*, the supermassive black hole at the center of the Milky Way. The GRAVITY collaboration and other researchers used ESO’s VLTI in Chile to observe stars around Sagittarius A* at a magnification 20 times greater than what was possible before the VLTI. This enabled to discover another star relatively close to the supermassive black hole, and by examining the orbit of that and other stars in that area, they estimated the mass of Sagittarius A* with greater precision.