I was thinking that this is the result of a lightning strike but Ive always seen them take some sort of path and not just be a circle.
UFO videos – This interesting daytime footage of a solid unidentified flying object hovering in the sky above Paris in Kentucky was recorded on Saturday, 20th October 2012.
Witness report: While mowing my pasture in KY on 10/20, I came across this circular patch of ground approximately 14 in diameter. The plants are dead, the soil is discolored and balled up, and the rock on the surface has an orange tint in the center of the circle.
Author (source: mufon)