The star that went around Sgr A* - the key diagram of Genzel's #iya2009 talk; one can derive the mass of the central object of the Galaxy from these data, taken with ESO telescopes over many years.

The star that went around Sgr A* - the key diagram of Genzel's #iya2009 talk; one can derive the mass of the central object of the Galaxy from these data, taken with ESO telescopes over many years.