One of the first known black holes is more massive than once thought – Engadget

Astronomers might need to adjust their expectations for black holes. According to the New York Times, an international research team has determined that Cygnus X-1, one of the first discovered black holes, is considerably more massive than once thought. The binary-system based hole was originally pegged at ‘just’ 15 solar masses, but is now believed to be 21 solar masses.
That may not sound like much when supermassive black holes are equivalent to millions or even billions of solar masses, but it’s…

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