<blockquote><font class="small">In reply to:</font><hr /><p>I'ts far easier to crash a large body on the surface of a planet, literally as easy as rolling down hill, than it is to land a complicated drilling device, which can operate at Minus 183 C. <p><hr /></p></p></blockquote><br /><br />Ah yes, the mission profile some jokingly call "lithobraking". <img src="/images/icons/tongue.gif" /><br /><br />The main problem I forsee is that Titan's thick atmosphere will slow the craft down a lot. Consider the Genesis crash; it barely made a dent in the Utah desert. Reentry had slowed it considerably. This was partially intentional; you could adjust the entry profile so that it doesn't slow down so much. But then you'll burn off more of the impactor, and less will remain to make a nice big dent, which means you'll need a bigger impactor. Furthermore, you have the complication of trying to study that dent through the thick smog of Titan. So although crashing is easy, doing something with that crash is not a trivial problem. It's an interesting one, though. <img src="/images/icons/wink.gif" /><br /><br />Maybe the best way to acheive it would be with explosives. It would be similar to the ICBM concept; a reentry body contains a powerful bomb, protecting it through atmosphere interface. At a predetermined altitude or time, it detonates. Sort of an interplanetary bunker buster. But imagine the protests for THAT vehicle! <img src="/images/icons/laugh.gif" /><br /><br />Personally, I find the atmosphere of Titan very interesting; this would not be studied as well by an impactor, and could even hinder atmospheric studies by introducing a lot of contamination. For this, a long-duration lander would be ideal. Something like Viking, with an RTG to power it. If Huygens could've had an RTG instead of a battery, it could still be returning data today. (But then it would've been heavier, and would've needed some way to isolate the RTG from sensitive electronics, and so forth. All these trade-o <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>