Sнσcк ωανєѕ ѕтяєαмιηg fяσм α נєт fƖуιηg αт ѕυρєяѕσηιc ѕρєєɗѕ

If you could see the shock wave from a jet moving faster than sound, this is what it would look like.
Shock waves streaming from a jet flying at supersonic speeds. The jet is passing in front of the sun, and dark sunspots are also visible. Image via NASA.The jet is passing in front of the sun, which gets its purple color from a calcium-K optical filter. Dark sunspots are also visible. Image via> NASA Earth Observatory.

A team of NASA researchers generated the images and other like it (here and here), using a modern version of a 150-year-old German photography technique called > Schlieren imaging. A NASA webpage explained that, in the images on this page, shock waves appear darker because changes in the air density affect how much light is refracted. > NASA wrote:

The white cloud forms as a result of the supersonic expansion fans dropping the air temperature below the dew point.

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