Alien planet hunters redefine the 'habitable zone' - and find Earth is right on the edge

Alien planet hunters redefine the 'habitable zone' - and find Earth is right on the edge | Mail Online: "In astronomical terms, it is known as the 'habitable zone, or the 'goldilocks zone', where condition are not too far, and not too close - just right for life to exist. Now researchers have redefined the boundaries using new, more accurate calculations - and found that Earth is right on the edge of the habitable zone."