Yeah! You are absolutely right. Life originated from natural process. Let me tell you that life is not possible without the existence of sun. The plants cannot live the animals cant live and the humans can't survive. And the sun is a great contributor to creation of life and its existence. And, what do you think sun is made up of? Its made of fire. The nuclear reactions going on in its nucleus provides energy and it burns. So, Fire is the ultimate source of life.