Our solar system resides in an area of our galaxy called the "Local Bubble" [wikipedia.org], roughly a few hundred lightyears across. This region is very empty compared to the average interstellar medium in the galaxy, as a result of a large number of supernovae that blew out a sort of cavity in our interstellar neck of the woods long ago. In actual structure it's more of an irregular "Local Chimney" [solstation.com] going right through the galactic disc rather than a spherical bubble.
As a result, pinning the cause of TFA's observations to a single supernova is not all that simple, as supernovae were very common in the Sun's general neighborhood in our galactic past..
Here's a nice graphic of the larger features in and around our local bubble [nasa.gov]. It's a fascinating subject if you enjoy understanding our location in a galactic context.
Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/-7NgoMvr3Jc/story01.htm
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