It was a bright white round light and it looked like it was travelling straight up in the sky like a rocket, and then would disappear and re-appear across the other side of the city within seconds. It looked like a giant star that hovered, and then disappeared, and re-appeared and it did that for about 4-6 minutes, then it was gone. It had no other lights, it just ascended into the night sky, then vanished and the next second it was all the way across the sky. It was really odd.