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Calculate the Schwarzschild radius (in kilometers) for each of the following:

a. 10^8Msun black hole in the center of a quasar
b. 5Msun black hole that formed in the supenova of a massive star
c. a mini-black hole with the mass of the Moon
d. a mini-black hole formed when a superadvanced civilation decides to punish you by squeezing you until you become so small that you disappear inside your own event horizon

 

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