An aurora, shining high above the northern part of Saturn, moves from the night side to the day side of the planet in this movie recorded by Cassini. These observations, taken over four days, represent the first visible-light video of Saturn's auroras. They show tall auroral curtains, rapidly changing over time when viewed at the limb, or edge, of the planet's northern hemisphere. The sequence of images also reveals that Saturn's auroral curtains reach heights of more than 1,200 km (746 mi) above the planet's limb. These are the tallest known "northern lights" in the solar system. Each image was obtained with a two- or three-minute exposure, taken in visible light with the Cassini spacecraft's narrow-angle camera from October 5th to 8th 2009.
