From Twitter https://twitter.com/: Right #now Chandra is observing Tycho's supernova remnant. This spectacular debris field has expanded by about 100 billion miles since the first time Chandra observed it in 2000. More Tycho: http://chandra.si.edu/photo/2016/tycho/ #Today's Obs: 6h 23m https://twitter.com/chandraxray/status/931637863267164160/photo/1 https://chirp.cooleysekula.net/attachment/43245