Was it a missile? Was it a jet? The speed seemed about twice that of F-16 Jets that I normally see in the sky. It did not leave a smoke trail - I am sure of this because it was still light enough in the sky to see any sort of thing. It also did not make any noise. When compared to a shooting star/meteor, the speed was about half of the amount. The brightness was about 5x to 10x brighter and the size was about 3x larger. So the speed was somewhere in between a meteor and a fighter jet. It was the coolest thing I have seen in the sky so far. How are you sure it was a "fireball" and not something else? What is a "fireball" anyways?