# Event Horizon

1. May 17, 2005

Could someone give me a formula that would describe an event horizon, and also explain your view?

2. May 17, 2005

### tony873004

$$v_{esc}=\sqrt{\frac{2GM}{r}}$$

$$v_{esc}^2=\frac{2GM}{r}$$

$$r=\frac{2GM}{v_{esc}^2}$$

escape velocity = speed of light (c)

$$r=\frac{2GM}{c^2}$$