Apparently, I'm impressed by supernova remnants, because here we have yet another post about supernova remnants. Let us become aquainted with SNR 0509-67.5. SNR 0509 spans about 23 light years and lies about 160,000 light years away toward the constellation of the Dorado. The red coloration is attributed to Hubble's filter allowing only light emitted by energetic hydrogen, in red saturation, to be seen. We're not really sure the precise reason for the ripples you see here, but we know the story behind the broader, red glowing ring. The expansion speeds and light echoes relate it to an Type Ia supernova, the explosion of a white dwarf star, that occured 400 years ago.
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