I’m a commercial airline pilot.

While flying at FL 380, at 0055z I observed a round white donut and a lighted moving object within it. The observation lasted five minutes. Sky conditions at cruise altitude were clear with unlimited visibility. No moon illumination was present in the starlit sky. Winds aloft were 310/20 and my ground speed was 445 knots. There was a scattered undercast cloud layer with tops around 10,000 ft. The glowing object within the donut was slowing moving, and I do not attribute its movement to autokinesis. After five minutes of observation the lit object vanished and the white donut dissipated within a minute. One photo was taken.