Most of the pictures are taken with a lot of light (flashlight?) coming out of the camera direction. This picture for example shows it very clear: http://astrop

Most of the pictures are taken with a lot of light (flashlight?) coming out of the camera direction. This picture for example shows it very clear: http://astropedia.astrogeology.usgs.gov/alfresco/d/d/workspace/SpacesStore/a858577a-6350-4a45-87cc-1d32e064611a/AP12pan.jpg http://astropedia.astrogeology.usgs.gov/alfresco/d/d/workspa... So there is light from the sun, camera and even earth maybe.