Near the Earth's poles a magnificent spectacle of shimmering colored light can sometimes be seen --- the aurora. The aurora is called the (Northern lights) and the aurora austrails (Southern lights); it can appear as bright as a full moon. The aurora usually appears near the Earth's poles, and more northerly (or southerly) your latitude, the more impressive the displays you will see. The lights vary in color from whitish-green to deep red and take on shapes such as streamers, arcs, curtains, and shells. But we still don't know what causes ....