Cross-shaped, white object with blurry or foggy appearance (possibly pulsating) moving at low altitude but high rate of speed

The object was spotted moving quickly across the sky above my head at what appeared to be fairly low altitude. The object was blurry or foggy looking (possibly pulsating). It was in the shape of a cross. It happened quickly and I was the only witness. No pictures were taken. There was no noted sound. I'd been specifically listening to the frogs in my pond and the owls in the woods behind my house. The sighting did not startle my horses either. The object was moving fast enough that it was over in just a few seconds.