100:00:04,320 --> 00:00:07,720This is one of the most sophisticated space vehicles 200:00:07,720 --> 00:00:09,520ever built. 300:00:13,720 --> 00:00:15,800Curiosity is a billion-dollar rover. 400:00:20,080 --> 00:00:25,520In six days' time, it will attempt to touch down on Mars. 500:00:25,520 --> 00:00:27,360Landing a big rover is a tough business. 6