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The radius? The radius of a black hole may very well be infinite. The schwarzchild radius is give by: 2GM/c2. G is the universal gravitational constant, M is the mass (16 suns in your case), and c is, of course, the speed of light. G is 6.67 x 10-11 m3 /(kg∙sec2)]. M (one sun) is 2x1030 kg. c is 3x108 m/s

Put it all together, and rs is 44,500 meters, or 45 km.

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