: No way can a planet survive in the Centauri system, : there are three stars about couple hundred AU's from : each other, their gravitational pulls would neither : make the planet collide with a star or gain speed : and escape into space. If there is a planet, it could : be a gas giant like Jupiter. I suggest you use stars : like 51 Pegasi or 47 Ursae Majoris, they are stars that : have been proven to have planets.

There exist stable planetary orbits within a radius of 2 AU around both Alpha Centauri A and B. Since the stars are of spectral type G2 respectively K1, it is even thinkable that there exist terrestrial planets offering similar life conditions as we have on Earth. Please check the following URL for more information:

http://monet.physik.unibas.ch/~schatzer/Alpha-Centauri.html