Hubble saw the Same Supernova at Three Different Times Thanks to Gravitational Lensing - by spacewriter
The gravitationally lensed images of a distant supernova. The left panel shows the portion of Abell 370 where the multiple images of the supernova appeared. Panel A, shows the locations of the multiply imaged host galaxy after the supernova faded. Panel B shows the three images of the host galaxy and the supernova at different phases in its evolution. Panel C, which subtracts the image in Panel B from that in Panel A, shows three different faces of the evolving supernova.
The warping produced by the Abell 370 gravitational lens produced multiple images of the explosion over different time periods. That was possible only because the magnified images took different routes through the cluster. That was due to the differences in the length of the pathways the supernova light followed. Also, the slowing of time and curvature of space due to gravity affected light travel time.
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