It's the remnants of an exceptionally young supernova, only nobody recognized that fact when it was first discovered in 1985. It was only last year that researchers at NASA took another look and found that it had expanded its boundaries by 16%, making it the fastest moving supernova remnant ever seen. That speed could be the key to why supernovas in our galaxy are so scarce; the wavelengths at which its energy is being expelled are not usually looked for by astronomers. Now that we've discovered a new way to search, the hope is we'll see that other supernovae have been out there all along.
Via Science Now
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1985: good year.