We were outside on our front deck facing north around 9pm when i spotted a bright white light in the northern horizon surrounded by a circular white mist/cloud. as the object moved slowly towards the west, the white light in the center disappeared but the circular cloud remained and kept moving towards the west. the cloud seemed to be slowly swirling in a circular motion. it did get a bit larger as it moved closer. we lost it behind trees at that point and were unable to see it any longer.