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what do you think of this shot ??


pc1

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Alex,photo was taken in Hk, near the horse racing track,no horse races that day,very quiet evening.

 

well, maybe they're testing a new breed of jet engines, i was only wondring why i didn't hear a sound. they've probably developed a new silencer for these engines ?

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"This is a photo of an airplane vapor trail. It would have been a novelty in the 1950s, but by now we've all seen a few."

 

Right... It's actually called a "condensation trail" or "contrail" for short. Water vapor is a major component of airplane engine exhaust, so this is simply a cloud formed by the engines. This doesn't always happen; it takes the right temperature & humidity conditions at that altitude for the visible contrail to form. Military pilots may choose a different altitude to avoid making contrails. It tends to spread with time, so it's clear that in this picture the airplane must be at the upper left.

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