1934 1996

A typical neuron makes about ten thousand connections to neighboring neurons. Given the billions of neurons, this means there are as many connections in a single cubic centimeter of brain tissue as there are stars in the Milky Way galaxy.
—  Dr. Carl Sagan (1934 - 1996) American Astronomer and Science Author

An extraterrestrial visitor examining the differences among human societies would find those differences trivial compared to the similarities.

Our lives, our past and our future are tied to the sun, the moon and the stars. We humans have seen the atoms which constitute all of nature and the forces that sculpted this work and we, who embody the local eyes and ears and thoughts and feelings of the cosmos, have begun to wonder about our origins – star stuff contemplating the stars, organized collections of ten billion billion billion atoms, contemplating the evolution of nature, tracing that long path by which it arrived at consciousness here on the planet earth.

Our loyalties are to the species and to the planet. Our obligation to survive and flourish is owed not just to ourselves but also to that cosmos ancient and vast from which we spring.

We are one species. We are star stuff harvesting star light.

—  Carl Sagan (1934 – 1996)
YouTube: Uno de los discursos más conmovedores jamás pronunciado sobre la humanidad, la Tierra y el Universo

Carl Sagan fue uno de los divulgadores científicos más importante del mundo y una de las mentes más lúcidas de la humanidad. Sus palabras hoy tienen más sentido que nunca.

El astrónomo, astrofísico, cosmólogo y divulgador científico estadounidense Carl Sagan (1934 - 1996) se hizo famoso en todo el mundo cuando dirigió la serie Cosmos en la década de 1970. En ella le enseñó a toda una generación los secretos del Universo conocido. En 1994 publicó el libro El punto azul pálido: una visión del futuro humano en el espacio, y en él escribió una de las reflexiones más conmovedoras sobre la humanidad y el Universo.

Hay un video en Youtube donde se escucha la voz original de Sagan leyendo sus famosas palabras:

An extraterrestrial visitor examining the differences among human societies would find those differences trivial compared to the similarities.

Our lives, our past and our future are tied to the sun, the moon and the stars. We humans have seen the atoms which constitute all of nature and the forces that sculpted this work; and we, who embody the local eyes and ears and thoughts and feelings of the cosmos, have begun to wonder about our origins — star stuff contemplating the stars, organized collections of 10 billion billion billion atoms, contemplating the evolution of nature, tracing that long path by which it arrived at consciousness here on the planet Earth. Our loyalties are to the species and to the planet. Our obligation to survive and flourish is owed not just to ourselves but also to that cosmos ancient and vast from which we spring.

We are one species.
We are star stuff harvesting star light.

—  Carl Sagan, 1934 - 1996