Northern lights sine over Homer as seen from Diamond Ridge early Sunday morning. The Orionoid meteor shower also happened that night. One meteor can be seen flashing in the lower right of this photo. Alaska as far south as Kodiak had spectacular aurora viewing through early Tuesday morning. This photo was taken ag f 4.5 with a 70mm Nikkor lens on a Nikon D7100 camera at 2000 ISO for an exposure of 15 seconds. Atomic particles hitting the upper atmosphere cause the glow of the northern lights. Red and green colors are caused by particles hitting oxygen molecules.