Video: The search for a world like our own

Close to 300 planets outside our solar system have already been discovered. What if we find earth's twin?

The two leading planet hunters Didier Queloz, University of Geneva, and Debra Fischer, San Francisco State University, talk about their search for planets outside our solar system (exoplanets) and the possibility of finding an earth-like planet, with liquid water on the surface.

They discuss ideas regarding what such a planet would look like, what would grow, and what kind of life could exist.