![NASA is using a 21st century version of schlieren imagery to visualize supersonic flow.](https://www.nasa.gov/wp-content/uploads/2023/03/airbos_f7_p6.jpg)
Schlieren Images Reveal Supersonic Shock Waves
NASA is using a 21st century version of schlieren imagery, invented by a German physicist in 1864, to visualize supersonic flow phenomena with full-scale aircraft in flight.
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https://www.nasa.gov/image-detail/schlieren-images-reveal-supersonic-shock-waves-4/
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