Here on Earth there are places where surface conditions mirror the extreme environments found on other planets. Despite these harsh conditions, life has still been able to flourish which means there is a strong possibility that life may exist on the outer planets Taken From Horizon: Are We Alone In The Universe Subscribe to the BBC Worldwide channel: http://www.youtube.com/subscription_center?add_user=BBCWorldwide BBC Worldwide Channel: http://www.youtube.com/BBCWorldwide This is a channel