much discussion at unmanned spaceflight
http://www.unmannedspaceflight.com/index.php?showtopic=1937
Short answer is it looks very difficult, even with penetrators instead of complex landers.
Space/Science » in reply to Quadruple the cost?
http://www.unmannedspaceflight.com/index.php?showtopic=1937
Short answer is it looks very difficult, even with penetrators instead of complex landers.