3rd time Bright white light fades away.This is the third time I witness this. A bright white light within (I believe) our atmosphere, brighter than Venus, which dims and completely disappears. Last two times this "light" was moving very fast from SW to NW for a few seconds. This time it was hovering over at very high altitude, SW. From the time I caught it to the time it faded it must have been 10 seconds. Night on all 3 occasions was clear and full of stars. Light was bright white. Must note that all 3 occurrences were around the same time, between 11pm and 1am. Help?