It adds 1000 main sequence stars in M31, supporting life ! Okay, the addon is just adding the stars, and it's up to you to add the planets.
The Galactic Habitable Zone (GHZ : http://en.wikipedia.org/wiki/Habitable_ ... table_zone) is probably optimistic, in this scenario.
The HR plot of the L-stars :
Use the included CELX script to reveal the L-stars distribution with markers, since these stars are too small to be seen at a large distance. Use the alternate names (ex : M31 (L256)) to select a star and visit it (in the Andromeda galaxy !). While traveling through the galaxy, you can't click on the L-stars at a large distance, because they are pretty small while M31 is really a HUGE galaxy !
Enjoy !