Countless parameters have to be “just right” to sustain complex life. Not just 3 or 4 or 100.
http://www.youtube.com/watch?v=JnWyPIzTOTw
WE (humans) will be the life on other worlds. We’ll find planets that are “somewhat” livable and make them livable.
Not countless, just self replicating.
True. But there may be an infinite combination of countless parameters that produce life forms from the energy of the main star. They may all be 'extremely' different from the life forms of another 'GOLDILOCKS' planet.
As we see on Earth, there is no end to the variety of life forms produced by the Sun. So many that we discover new ones daily, and ... we've been at it a long time.