""We're finding things on Mars that are tantalizingly interesting..." via Unexplained-Mysteries Image Credit: NASA Carbon associated with biological processes has been discovered in samples analyzed by the rover. It's the news that everyone has been waiting to hear - possible evidence of ancient extraterrestrial life that scientists have speculated could have once thrived on Mars billions of years ago. But don't get too excited just yet because, as always with such discoveries, it is impossible to rule out alternative explanations and it will take further study (and possibly future missions) to know for sure. The excitement surrounds the results of an analysis of powdered rock samples carried out by the rover's on-board Sample Analysis at Mars (SAM) chemistry lab. The results indicate the presence of a type of carbon usually indicative of biological processes. "We're finding things on Mars that are tantalizingly interesting, but we would really need more evidence to say we've