I was driving home from work and it was already dark. I saw a greenish bright object moving at a fast speed in the sky. It seemed to have a trail like a comet and for a split second the green ufo stopped in mid air. it exploded, or more precisely it seemed bigger for a split second, as if it had slow down or maybe everything slow down temporarily. Then what seemed to be and smaller greenish flying object moved in what seemed like at an angle from initial trajectory. Everything happened really fast and I was driving but it wad perfectly clear in the sky.