Out in the cold and dark between worlds NASA scientists listened in vain Tuesday for a sign that the tiny Mars Pathfinder lander was still alive on the dusty red planet. But after four hours of waiting in vain, space officials declared the historic mission over. “The official ‘Time of Death’ was 1:21pm PST”, said Jennifer Harris at the NASA Jet Propulsion Laboratory in Pasadena, Calif. Harris was one of the original Pathfinder mission Flight Directors. And while most of her team had long ago been disbursed to other projects, Harris was present Tuesday when the last attempt at contacting the craft was made.