So I was off by only three orders of magnitude - a trivial error! Thanks, Engineer, for the correction and for putting that still-huge radius into context.
I'm not very good at this - can somebody please help? I'm trying to calculate the Schwarzschild radius of a black hole of 30 billion solar masses. The result I get is on the order of 10 light years! That seems high. Does anyone have a simple formula?
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