I was at home, looking up into the sky in the evening, and saw 4 white lights, quickly moving from south to north. I first noticed them when they were almost directly overhead, and lost sight of them when they reached the horizon, about 3 seconds later. The 4 lights appeared to be connected as one object; they were very close together, and in a row perpendicular to the direction of travel. There was no sound. They were moving much faster than satellites appear to be moving. They were unlike any airplanes I have seen (moving too quickly; no sound; traveling in an unusual direction for the area). I would like to know how to find out what it might have been.