befire we move on thus topic, i will put any one exited planet as a model and as per its moon we will take moves on discus,that how and why,there is life not possible! life circal for water is the most ansd very first or can say fundamentaly need of animets. we think is supposr there a some store of water and now we can go for live there ,then we will fall a wrong in it. becouse , there be a store of water and source of it its a deefrant tning. we all know that