Brooklington t1_jee3lxg wrote
Reply to comment by beatvox in Ultramassive black hole over 30 billion times mass of our sun has been spotted. The discovery had been made possible thanks to a phenomenon known as gravitational lensing — the first time a black hole has been spotted in such a way. by Wagamaga
The technique used to detect the black hole in this case is to use a model to predict what the image would look like with and without the black hole. The model that fits the data best is consistent with a black hole of the size quoted.
[deleted] t1_jeemixi wrote
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