I took a picture of night scene, and I found a UFO on one of my pictures.I just wanted to take some night pictures and had a few shots at that night from my apartment. Then I found this picture which has a strange lightening flight thing in the dark sky.The shutters' speed was 2 seconds.If you crop the flight part and put 'auto level' on it, you'd find flashes from the flight.What the heck is that?