Walking along the Yarra River in Abbotsford, Melbourne, enjoying the vast areas of parklands and nature reserve along the river, one can momentarily be distracted by a passing jet up in the sky, leaving behind it long streamers of contrails...
Contrails (short for "condensation trails") or vapour trails are long, thin artificial clouds that sometimes form behind aircraft. Their formation is most often triggered by the water vapour in the exhaust of aircraft engines, but can also be triggered by changes in air pressure in wingtip vortices or in the air over the entire wing surface. Contrails are made of water in the form of a suspension of billions of liquid droplets or ice crystals.
This post is part of the Skywatch Friday meme,
and also part of the Friday Greens meme.