Black Triangle Sighting in Maine on March 11th 2016 – dark triangle shape moved quickly, covering and then uncovering stars, bottom 3 of the Big Dipper..moved quickly with no sound

My first UFO ! The night is very clear and the stars are bright. I saw a plane and then continued staring at the stars. Very quickly a triangular shaped object moved overhead blocking the stars, for approximately 2 to 4 seconds. It was very quiet, and it stunned me. It was difficult to tell how big or how high the object was. I feel like it could have been hundreds of feet long and wide and up thousands...or even a mile long, and even higher in altitude. I did not see any lights because of all the stars. The sky is absolutely filled with stars tonight. I then watched another plane go by. Sorry that is all I have.