We Are Not Alone boldly argues that extraterrestrial life is astrobiological fact. Far from existing light-years away in the outer reaches of space, it's on our very doorstep. For persuasive evidence of microbial life, we need look no further than our celestial neighbour, Mars. Expertly probing the latest scientific research, this fascinating book provides compelling reasons to believe that extraterrestrial life is rife both in the Solar System and beyond.