The image shows a simulation of a collision between two shells of matter ejected by a massive star in two subsequent pulsational pair-instability supernova eruptions, only years apart, just before the... more 
The image shows a simulation of a collision between two shells of matter ejected by a massive star in two subsequent pulsational pair-instability supernova eruptions, only years apart, just before the star dies. Image released Feb. 7, 2013. less 
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SPACE.com | Photo By Ke-Jung Chen/School of Physics and Astronomy, Univ. Minnesota.
Mon, Feb 11, 2013 4:12 PM EST