AlphaPhoenix built a 2-billion-FPS camera that captures light moving in real time.

This is a camera that I built last year that shoots at a billion frames per second. What could possibly be cooler than that? A camera that shoots at 2 billion frames per second. And this is what that looks like at 2 billion frames per second. Light moves about 6 inches, or 15 centimeters, per frame of this video. Light moves about 6 inches, or 15 centimeters, per frame of this video.

This beam of light is traveling at the universe's speed limit.