Low flying craft flying at exceptional speed.

Walking in a parking lot, I spotted a light, what I suppose a craft, that flew across the sky at speeds beyond any plane, drone, military device etc. Flew around the height of a helicopter and wasn't high enough to be a plane. Flew in a straight line. I've seen a shooting star before, and this was definitely not that. I suspected at first a fighter jet, as we see them in my area. This object made no sound so a jet was ruled out, and besides that it was moving at an insane rate of speed. It crossed the skyline that I could see - maybe 4 miles - in less than a second. The object gave off a single light and faded out into the distance obtaining the same direction and elevation.