<blockquote><font class="small">In reply to:</font><hr /><p>Maybe, I would need to blow off the dust, and check the geometry, very time consuming. Oh, and it does not have be be ice, just simple matter.<br /><br />It would be cool, if it were true ;o) <p><hr /></p></p></blockquote><br /><br />Yes it would. <img src="/images/icons/wink.gif" /><br /><br />One possible blow to your theory is that Iapetus has a fairly even distribution of craters. (The most notable exception to this seems to be the area around the equator, near the huge ridge. This is probably not coincidence; whatever created the ridge could easily have resurfaced the area around it.) What's not even is the coloration. The leading face of Iapetus (like our moon, it is tidally locked) has a light coating of dark stuff on it. This coating is clearly younger than most of the craters, judging by the way it is distributed across them, particularly near the margins of Cassini Regio (the dark area). There are many theories as to how the coating got there. None are entirely satisfactory, and for the most part, none can yet be tested. It was hoped that the recent flyby would help resolve it, and it did answer some of the questions, but it didn't provide the key. Perhaps the 2007 flyby, which is considerably closer, will tell us more. <div class="Discussion_UserSignature"> <p> </p><p><font color="#666699"><em>"People assume that time is a strict progression of cause to effect, but actually from a non-linear, non-subjective viewpoint it's more like a big ball of wibbly wobbly . . . timey wimey . . . stuff."</em> -- The Tenth Doctor, "Blink"</font></p> </div>