This photo is on rense.com. I invite you to go there to see the full article and various comments. I’ve linked from here in order to comment on it in as much as I’ve photographed these from the ground on three occasions.  I’ve heard people try to explain them as the effect of Photoshop on stuck pixels but while some features of Photoshop might create a round blur by averaging single stuck pixels, it wouldn’t have the shading or defined edge inside the blur that these do.  My photos are several years earlier in this blog.  These things can hover in one location for long periods of time, sometimes days, or they can accelerate and maneuver rapidly.  I don’t have any infrared equipment but someone who has photographed these in Vancouver BC does and they appear to glow in the infrared.