The speed of light.
The amazing speed of light holds the key to everything from the untold power of the atom to the possibility of time travel.
The speed of light, 670 million miles an hour.
This prediction of Einstein’s that the speed of light is the same for everyone is one of the strangest in physics. But it’s true. It’s been shown by hundreds of experiments. The speed of light is going to be the same, no matter how fast you’re moving towards it or away from it.
Welcome to the realm of time travel.
