Here’s the story explaining it-
http://gizmodo.com/5422792/this-is-how-the-mysterious-giant-spiral-happened
And photo of the vapor trail-
http://gizmodo.com/5422796/missile-trail-gallery/gallery/1
Someone posted the photos on one of these threads about the lights. Too many to go through, but I highly doubt that aliens would waste their time spinning around in the sky just to leave a vapor trail in the morning, and create a light show.
Thx