Description:

    The home planet of your civilization.  This is the planet on which your planet either evolved, or at least has existed for long enough that any previous location is forgotten.  For most game types, this is the planet on which you start out, and try to spread out from. 
    Since this planet contains the entire biosphere in which your species evolved, this is the only place to get genetic material that will be at all compatible with members of your species.  Any DNA and other genetic data obtained in other locaitons, while possibly useful in itself, will be useless for agriculture and health care purposes for your species.