I was driving late at night / early morning a little after 2 am. As I turned left, off of East Street on to rt 47 I saw this object appear just above the tree line to my left. It was a swirling mix of light blue and light green. It proceeded to travel to my left and burned out. I saw the entire event from its appearance till it burned out in its entirety. I could clearly see what looked like a gaseous swirling cloud around a lighter central core as it passed over head..