Smooth moving black triangular shaped object with white dots on bottom, flew over us at about 500 feet above us.I was the first to notice the unidentified flying object above us. I was resting on the ground after a big dinner, looking upward at the stars. I said to my wife, "Hey look at that!! There is a UFO flying above us."She immediately looked up at where I was pointing. Our nephew jumps out of the backseat of the van and saw the same thing we were witnessing.It flew over us going slow like it was a gladder or something that goes that slow. It didn’t have any flashing lights or make any sounds. It did have mirrors or something that reflected the lights of the city on the bottom of it. It went behind some tree and the sighting was over in about 20 seconds.We all agreed that we had seen the same thing. That was the first time my or the nephew had ever seen any thing like before in their life time