I was out back of the building (win plastics) for a cigarette break and a very loud helicopter went by directly overhead. after watching it, i looked up in the sky straight ahead and then to the right. i only spotted it because it was obscuring the view of the stars and cirrus clouds as it flew by approximately 2,000 ft (perhaps more) up and it had no marker lights and made absolutely no sound. it was an enormous black triangle shape (at least 80-100 ft. long). i'm 53 and have seen plenty of meteors and strange orbs etc in the sky but this i have never seen before. i know what a b2 looks like firsthand from air shows, youtube etc., and this thing looked much larger than any b2 i have ever seen. i tried to get my camera out but by the time i did, it had moved past me into a darker portion of the sky and i could no longer see it.