Aquí dos párrafos:
... The planet, called Gliese 581G, is quite close at 20 light years from Earth's solar system. It is considered to be in the habitable zone because of its distance from its sun and its size.
Together, those two measurements tell scientists that any water on the planet will be in liquid form, and that the planet is large enough to have the gravitational pull to hold an atmosphere around it...
Aquí la nota completa.
Hasta ahora, la noción aceptada era que únicamente en la Tierra se daban (o se habían dado) las condiciones necesarias para soportar la vida. Esto abre muchas otras posibilidades.
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