What Is That Strange Phenomenon as F-22 Approaches Supersonic Speed?
Pilots in the years after World War II used to think of the sound barrier as an invisible wall in the sky -- something they would feel but not see as they broke through it.
There is no actual sound barrier. But as the Navy picture here shows, there is often a beautiful visual phenomenon as a plane gets close to the speed of sound. Here's an F-22 Raptor fighter jet as it passes through "high transonic" speeds, probably going more than 700 miles per hour.
Why the spectacular spray of vapor... Full Story
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