Ross Marsden
Senior Member.
Erm... I think the topic is photos or videos (in general) of large numbers of contrails. Well, that's what the title says, together with an appeal for help to understand how there comes to be scenes like this such large numbers of contrails.The topic is this photo and video. Not contrails in general.
What makes it astounding is just the visual impact of so many.
If there was no air traffic there would be none at all. If one plane flew over there would be one. And so on. The numbers are not the intellectual problem. It's easy to understand that.
The difficulty (for most) is, "What condition of the sky or atmosphere causes this to happen for any one of those planes, and today, all of them?"
And then the discussion moves to talking about contrail formation and their evolution in general.