He was also one of the first people to state the theory that light travels at a finite (although very large) speed.

He determined that these discrepancies were due to light having a finite speed.

The finite speed of light does mean that there is an event "horizon".

Note: the image linked to in the following table does not take into account the finite speed of light.

This approach is based on the finite speed of light.

Empedocles was the first to claim that light has a finite speed.

The speed of light was found to be very fast, but at a finite speed.

It's all around you, courtesy of the finite speed of light, 186,282 miles per second.

Because light travels at a finite speed, to look out is to look back.

The finite speed of light is a major constraint on long-distance space travel.