How will we find life among the stars? Looking for free oxygen (O2), a substance highly unlikely to find in nature, since it reacts with nearly everything not created by a reaction with it. It can only exist free if it is renewed by highly endothermic (energy-absorbing) reactions, such as created by plants.
That was the premise of movies like Alien/s or Red Planet with Val Kilmer where humans sent plant spores to terra-nize the planets for colonization which is the normal step. God knows how hard it is to live amongst brain-dead liberals.