Scientists believe either the moon has a rocky core that is shaped like a rugby ball, or it has a vast ocean beneath it's surface. If it is a vast ocean, which is favoured by one of the researchers, Dr Tajeddine; then it has huge implications for supporting life. It would lead to becoming a future candidate for a human colony. It might also have the potential for microbial life in the ocean if it does exist. That would be a massive discovery!