Modern astronomical instrumentation allows Einstein's theory of relativity to be tested at the black hole at the center of the Milky Way. A glimpse. The near-infrared image of the galactic center with adaptive optics (right) has 20 times more spatial sharpness than the image without adaptive optics (left). (Image: MPE/ESO) The SINFONI and GRAVITY instruments, deployed at … Continue reading Missing Link: How the stars in the center of the Milky Way are measured →