... The Quiet Sagittarius A . ... Credit: X-ray - NASA / CXC / Q. Daniel Wang (UMASS) et al. IR - NASA/STScI Explanation: Hot gas is hard to swallow. At least that seems to be true for the supermassive black hole at the center of our Milky Way Galaxy . Known as source Sagittarius A* , the Milky Way's black hole is centered in this infrared (red and yellow hues) and X-ray (blue) composite. ... Publications with keywords: Sagittarius - black hole . ... Spin up of a Supermassive Black Hole . ...