Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2013 September 6 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..