MIT Physics Engine Shows What Would Happen If Light Traveled at 6.5 ft/sec

As light slows down, one of the first things you'll notice is the Doppler effect.

Light is all around us so we never think about it much, but the truth is that the way we perceive the world depends very much on light's super speed. What would happen if light were to slow down to a walking speed?

This is the question YouTuber The Action Lab and a bunch of MIT scientists asked. In fact, the scientists created a special computer game where you can see the effects of the speed of light slowing down.

"In this video, I show you what it would look like to slow the speed of light down to around walking speed. So with just walking around town you would experience relativistic effects. I talk about time dilation and length contraction and what it would look like to have it happen to you," says the YouTuber in his video description.

The game is quite simple. You walk around a town at a speed of 6.5 feet/second (2 meters/second) and collect orbs. Each orb you collect slows down the speed of light further creating some pretty nifty effects. The final goal is to get the speed of light down to your walking speed.

One of the first things you will notice is the color change due to the Doppler effect. What is this effect and what does it have to do with the speed of light? Watch the video to find out all that and more.