Casper, WY / Cristine Pluntz via Facebook

There was a mysterious blue streak across the sky over Casper and other areas of Wyoming. It was seen as far as Sheep Mountain near Cody. There were multiple pictures of it on Facebook and even a YouTube video capturing the streak. Some were quick to blame it on chemtrails, UFOs, or even Batman, but what do we really know about this blue streak across the sky? For one it happens from time to time. They are called anticrepuscular rays. It is kind of like the back side of a shadow that happen usually during sunrise and sunset. They are usually caused by a far off mountain peak that is not visible.  Although I do wish it was Batman.