It was like nothing I had ever seen before.

I was about 9 yrs. old, playing in my back yard. I looked up over the house at about a 45 degree angle and saw a craft. It was like nothing I had seen before or since. It was multi-facited and it seemed like there were antennas sticking out. There was no sound, lights anything. It was huge. I watched it come out of the west and at first thought it was an airplane. It left no trail and finally stopped. I guess it was about as big as my thumbnail if I held my arm outstretched. I was daylight. I can only guess at the time. The sun did not reflect off of it. It was a slate gray color. After a short time it turned back to the west and slowly left my sight.