Originally Posted by Nate4641
I never understood why we have to find an earth-like planet to find life.
I totally understand what you're saying about organisms being able to adapt, but from our understanding, the minimum requirement for sustaining life is water. Since water evaporates and freezes at certain temperatures, the atmosphere must therefore be between the freezing and boiling point of water so that it can stay in liquid form.
Perhaps one day, we will find a water-like substance in another planet composed of elements unknown to mankind which can also support life.