Incident occurred while walking the dogs looking up in the evening sky at the stars noticed a large gray arrow like object go over the house at an altitude of about 500 feet without any sound was very distinct grey silhouette type object then I saw it fade into the sky and then reappear a few minutes later shaped as a rectangle. I could not believe what I was seeing. I ran back into the house with the dogs in toe to tell my wife. She noticed me to be visibly shaken. I went back outside to see it go beyond the house but shaped as a rectangle.