Breaking the Sound Barrier
This familiar image is of a plane that is moving faster than the speed of sound.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"FA-18 Hornet breaking sound barrier (7 July 1999) - filtered."
http://en.wikipedia.org/wiki/File:FA-18_Hornet_breaking_sound_barrier_(7_July_1999)_-_filtered.jpg
Wikipedia
Public domain.
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