Never mind Mars, alien life may be thriving right here on Earth, a major science conference has heard.
Our planet may harbour forms of "weird life" unrelated to life as we know it, according to Professor Paul Davies, a physicist at Arizona State University.
This "shadow life" may be hidden in toxic arsenic lakes or in boiling deep sea hydrothermal vents, he says.
BBC NEWS | Science & Environment | Alien life 'may exist among us'
Our planet may harbour forms of "weird life" unrelated to life as we know it, according to Professor Paul Davies, a physicist at Arizona State University.
This "shadow life" may be hidden in toxic arsenic lakes or in boiling deep sea hydrothermal vents, he says.
BBC NEWS | Science & Environment | Alien life 'may exist among us'