The Search for Earth Proxima

The Holy Grail that astronomers are looking for is an earth-like planet.  Our nearest neighbour is Alpha Centauri and this documentary focuses on a group of scientists whose ambition it is to build a telescope which could detect a planet within the habitable zone of this star system.  This is sometimes known as the Goldilocks Zone but even if a planet is in this area it may not support life.  These guys want to know for sure!