Astronomy & Space
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Schwarzschild Radius

Event horizon radius of a black hole.

Formula

rs=2GMc2r_s = \frac{2GM}{c^2}

Variables

GGravitational constant
MMass
cSpeed of light

Example

Sun ≈ 3 km

Did You Know?

Squeeze Earth to the size of a marble and it would become a black hole — that's its Schwarzschild radius.

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