large bright light with orange glow around outside silently flew @ treetop level S.W.of hghwy 19S.I was taking my dogs outside for a break and was standing on the road in front of my house when I felt like I should look behind me,my dogs suddenly ran out of the darkness and set on my feet. I looked behind me and saw a brilliantly lighted object crossing the night sky just above the tree tops. The center was a radiant white light, the outside ring had an orange color. There was no sound. The object moved smoothly, quickly and silently across the sky. It moved in a S.W. direction from highway 19 S.,it appeared to be about 300 feet away and it appeared to be bigger than---I don't know--bigger than a helicopter--it disappeared behind the trees.