This makes the original explosion the most recent supernova in the Galaxy, as measured in Earth's time-frame (referring to when events are observable at Earth). Equivalently, this is the youngest known supernova remnant in the Galaxy (140 years old), easily beating the previous record of about 330 years for Cassiopeia A. The rapid expansion and young age for G1.9 0.3 was recently confirmed by a new VLA image obtained in early 2008.
http://www.nasa.gov/mission_pages/chandra/multimedia/photos08-062.html
http://www.nasa.gov/mission_pages/chandra/multimedia/photos08-062.html
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