A giant wing shaped object, little slower than the typical passenger jets that fly over regularly. No lights or sound at all.It went from one cloud bank across the clear black sky into another cloud bank. Lasted about 45 very long seconds. Was shaped more like giant boomerang. It was about the same color as the clouds that night. I have no idea what is was...but it was such an incredible sight. We could tell it was much higher than an airplane. It was minimum 20 times the wingspan of a 747. That's what was so shocking about it. It seemed to be fuzzy around the edges...like a cloud...but unmistakably not a cloud. It was a giant wing shaped object...traveling a little slower than the typical passenger jets that fly over regularly. No lights at all...no sound. I found a couple picture on the internet that match it perfectly.