The closer the observer comes to the event horizon, the slower his watch will appear to run to a distant observer.

Question

Quizplus · Accepted Answer

This is due to the effects of gravitational time dilation, a prediction of Einstein's theory of general relativity. As an observer approaches a black hole's event horizon, the gravitational field becomes extremely strong, causing time to slow down relative to a distant observer.

The Closer the Observer Comes to the Event Horizon, the Slower