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In astronomy, a black hole's Schwarzschild radius is a radius length of influence of the black hole's event horizon.

The equation for the Schwarzschild radius is

$R_{sch} = \frac{2GM}{c^2}$

where

$G$ is the gravitational constant
6.67 10–11 N m2 / kg2
M is the mass of the black hole
$c^2$ is the speed of light squared
(299,792,548 m/s)² = 8.98755 × 1016 m²/s²

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