Jet forms 'shock collar' cutting through sky

[Still Waters]

It looks like the special effects department have been at work in this image of a fighter jet with a cloud of mist around it.

But this cloud created by a U.S. Navy Super Hornet off the Peruvian coast is known as a 'shock collar' or 'vapour cone', created in certain atmospheric conditions at high speeds.

In this case the £35million jet was flying at 760mph over the Pacific coastline having taken off from the aircraft carrier USS Carl Vinson.

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