Gridlock
Senior Member.
Ironically this 'contrail' is made of some pretty nasty stuff, but it didn't half catch the sunlight just right:
http://www.baynews9.com/content/new...s/articles/cfn/2015/9/2/ula_atlas_launch.html
http://www.theverge.com/2015/9/2/92...cket-launch-created-a-beautiful-multi-colored
http://www.baynews9.com/content/new...s/articles/cfn/2015/9/2/ula_atlas_launch.html
http://www.theverge.com/2015/9/2/92...cket-launch-created-a-beautiful-multi-colored