Small white object flying low and fast.I was in my back yard looking north. I noticed something white going from east to west at a high rate of speed. It was white, small, and looked round. It was only about 200 foot off the ground (too low for airplane) going in a very straight line (not a bird) and moving very quick (also not a bird).I did not hear any sound from the object, did not see flapping wings, and also no lights.