The picture I have chosen here is a supernova remnant, SNR 0509-67.5. The red color was recorded when a picture of this was taken that only filtered through the light emitted by energetic hydrogen. The reason I chose this picture, is because it is imbued with mystery. Scientists have still yet to discover why the remnant has ripples, as seen on the upper left hand corner. And, according to their calculations, the former supernova exploded around 400 years ago, as typical Type Ia supernova, meaning it came from a white dwarf star. However, another mystery remains embedded in that fact, which is the question, why wasn't this supernova seen 400 years ago when light from the initial blast should have been seen from Earth?
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