This is an Actual Photograph of the Shock Waves from Supersonic Jets Interacting with Each Other

After more than 10 years of hard work, NASA has reached another milestone. We’re accustomed to NASA reaching milestones, but this one’s a little different. This one’s all about a type of photography that captures images of the flow of fluids. It’s called Schlieren Photography, and schlieren is German for “streaks.” It was first developed …