I woke up, it was a normal day, when I was leaving home, I saw this strange trail on the sky. I don't know what it is. When I leave home, I always look the sky to know if it will rain or not during the day. It wasn't moving, neither changing colors, it was static. After some time, it suddenly disappeared. I haven't seen anything "known" in the sky (airplanes, helicopters, etc) and neither heard sounds. My friend said me that he had seen a little flying object, moving very quickly and suddenly disappeared leaving that trail. I can't confirm it because I hadn't seen it. Attached are the photos that I took with my mobile. Sorry about my English, I don't speak English, only Portuguese. I only know a little about English.