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 …



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