In this image (hi-res version), the sun is behind the camera, opposite the full moon (as usual). The mountain casts a shadow about 300 miles long, so we are looking down a shadow-tunnel. In the photo, the edges of the shadow converge due to perspective--it's like looking at railroad tracks that seem to meet in the distance. To learn more about mountain shadows, see Moonrise Through Mauna Kea's Shadow and the Shadow of Mount Rainier. For related images, see Atmospheric Optics: Rays and Shadows.
