Rectangular, grey, silent object passing over Thunder Bay, Ontario on August 17th.This was a "UFO" to me, but maybe there's an explanation for it. My husband thinks it might have been the bottom of the space station . . . I was looking for the Perseid meteors, and witnessed a grey rectangle cross the night sky smoothly, from west to east. It was silent. It looked like the flap from a cardboard box. It gave off no light of its own, just reflected some light from Earth. I don't know how big it was because I don't know how far away it was. It took about 30 seconds to pass completely out of view. I've viewed a lot of night skies, and have never seen anything like it. It wasn't spectacular, just kind of interesting. I'd like to know what it was.