A Sonic Boom Circulating online since 2001, with a caption claiming it was "a picture of a sonic boom." To many the photo seemed too sensational to be real, but in fact it was authentic, though the caption was misleading. Cones of condensation around planes are a common phenomenon, caused by a combination of humidity and aerodynamic pressure. A plane doesn't have to be breaking the sound barrier for a cone to form, but in this case the plane was about to do so.
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