Hoy fue un sábado muy sábado: películas con los viejos amigos viejos del colegio (los Freddys, el José Gabriel que llegó tarde); luego, pizza con José Leonardo y Jesús. De vuelta de la pizzería, no recuerdo por qué, surgió una conversación sobre la vida fuera del planeta Tierra. Ya en casa, visité como Dios manda wikipedia.org, y en la entrada sobre exobiología hay un link pa un debate de la Astrobiology Society. Muy interesante. Aquí, un fragmento:
"How do we define life as we do know it? Life on Earth has DNA, a specific genetic code. It also uses only 20, and the same 20, amino acids. Life is always cellular according to some people, but I think not. I personally define a virus as alive.
As for other life, what could it be? Could there be non-DNA life? If such life does exist, what does chemistry permit? Certainly chemistry permits certain types of life on our planet and others not. But once we move out in the solar system, especially in the vast realm of cold, chemistry changes. There could be different information systems, different solvents, different membranes. And as we go from hotter to colder, when we go to Venus, out to Mars, to Europa, and to Titan, we really should expect radically different chemistries."
la página con el debate completo
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