Hi. I apologize if this question has already been made. Unfortunately it's also difficult for me to formulate, especially in english. If you consider the Sun and Earth as an isolated system, where the Sun is able to produce energy indefinitely (it's not going to become a red giant), will life on Earth eventually end anyway? I mean, because of the second law of thermodynamics I believe that everytime energy transforms (for instance when I eat some living being) a fraction of it will not be usable again. Eventually all useful energy to sustain life will end. Is this right? What about the Sun? If the previous reasoning is correct, can some life form exist thanks only to the energy produced by the sun? I honestly don't think so; unless new life is created like in the beginning (see last question). So, my belief is that there is only a certain amount of energy on Earth that is exchanged with loss among living beings and eventually all energy will be lost and life cannot be anymore. But, then, the ultimate question remains: how the hell did life even begin?