This weeks APOD is about these two supernova shells and wether or not they are related. To find out they used an 8 meter telescope, the Gemini Telescope, one of the biggest telescopes in the world, on top of a mountain in Chile. They used the telescope to look at the double-lobed cloud DEM L316. The image of the two shells is extremely detaild and led astronomers to believe that the two had nothing to do with eachother. The first supernova is a Type I which means it's the result of a white dwarf exploding. The seond supernova is a Type II which is the result of massive normal star exploding. Because the two processes are on two totally different time schemes the two most likely did not form together and are therefor not physically associated. The two clouds are now thought of to be superposed by chance!
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