Saw a slow moving large object that was silent.

I was looking at stars in my driveway with my 2 year old daughter. As we were looking I noticed a dark object that seemed like a cloud moving slowly above our house. As I looked longer I realized it had a very defined boomerang triangular shape. It was very large at least twice the size of a house and it gradually moved forward as if it were a cloud in the wind. It went from above our home across the street over my neighbors home then vanished in the distance. The object seemed transparent as if it were trying to be cloaked but a hard outline was visible with the backround as it moved. I tried to capture a video, but it only shows a pure black screen on playback. I would say it was about 100 feet at most above the tops of the homes. At first I tried to dismiss it for a flock of birds but they were low in the sky and no audible sound and defiantly lower than any plane would fly.