NASA is using a 150-year-old photographic technique with a few 21st century tweaks to capture unique and stunning images of the shockwaves created by supersonic aircraft. Called schlieren imagery, the technique can be used to visualize supersonic airflow with full-scale aircraft in flight. Usually, this can only be done in wind tunnels using scale models, … Continue reading "Dramatic Imagery from NASA of Supersonic Shock Waves"