Professor James Kasting suggests that Gliese 581g is 'smack dab in the middle' of the zone which, along with its size and composition, makes it the most exciting and realistic prospect for extra-terrestrial life yet.
More recently, scientists have joined in on the collective wonderment after the first discovery by astronomers of a new planet - Gliese 581g - that could almost certainly support extra-terrestrial organisms.
Humans have long been fascinated by the possibility of extra-terrestrial life. Novels, films, and folk tales have encouraged curiosity and speculation about what might be 'out there' in space.
In the movie Skyline, strange lights descend on Los Angeles, drawing people outside like moths to a flame. An extra-terrestrial force threatens to swallow the entire human population off the face of the earth.