If you don’t believe me, (and you, lifebeyond, et. al., obviously don’t) you can produce effects similar to those I’m describing by performing a little experiment.<br /><br />1) Find a digital or 35 mm camera. <br />2) Find a rubber ball or tennis ball.<br />3) Put a rod in a piece styrofoam. Place the foam and styrofoam on a table in a room that can be completely “blacked out.” (This will eliminate light or reflection from any additional sources.)<br />4) Put the ball on the end of the rod. (The rod will eliminate any reflected light from the table’s surface.)<br />5) Place a light source at an angle in the room so that the illumination of the ball matches the terminator shown on the photo of Iapetus. <br />6) Place a few Xs or marks on the “nightside of the ball. (To closely approximate the apparently highly reflective surface (albedo) of the moon, you should add reflective tape or foil to half the ball, approximately in line with the terminator, or cover the entire ball. Place the X's, of course, on the surface of the reflective covering.)<br />7) Take photos of the ball, over exposing until the X’s or marks appear in the photo with the same relative clarity shown in the photo in question.<br />8) Look at what happens to the well lit, leading edge of the photo as the exposure increases. <br /><br />(I'd do it for you, but I'm on the road, writing these posts between training classes and don't have the time and the materials with me.)<br /> <br /> <div class="Discussion_UserSignature"> <strong><font color="#3366ff">Made weak by time and fate, but strong in will to strive, to seek, to find and not to yeild.</font> - <font color="#3366ff"><em>Tennyson</em></font></strong> </div>