It's back again in the last week by Itself.Again only one came from the west and headed North East. It was just like the others but seemed to be by it's self other than a crossing satellite and large aircraft. I WOUNDER IF NORAD sees these. THEY NEVER MAKE ANY SOUND THAT I CAN HEAR. It has been 4 years since the last big one until this summer. I ask the ranchers around NORTHERN Nebraska to watch the sky tonight.