The HONEST truth is, we don't know what most Unexplained Aerial Phenomena might be. However just because we can't always pinpoint exactly what these blurry images are, does not constitute proof that they are alien spaceships. In fact, any alien civilization capable of mastering light year space travel would not waste time buzzing our skies for no reason, a waste of both resources, fuel, and time. So if anything, a little thought about this pretty much proves they are of human origin.