this is really interesting to me because i go on this site all the time. Nasa HD ISS views is an awesome site. live views of the ISS. and as you watch, the ISS is travelling into the night, and the thing to the left fades along with it, which leads me to believe it’s something reflecting on the camera lens. only one thing, i have never seen that mark before in all the years i’ve watched the ISS HD Views. but i have seen other marks. no i do not think it’s a ufo.