I found the measurement error from previous methods, which I presume are based on red shift, to be the most interesting part of the article.
quote:
Previous reported distances to NGC 4151, which contains a supermassive black hole, ranged from 4 to 29 megaparsecs (13 to 94.5 million light-years), but using this new, more accurate method, the researchers calculated the distance to the supermassive black hole as 19 megaparsecs (62 million light-years).
Why were previous measurement attempts so disparate? Any ideas?
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