With the help of a tiny fragment of zircon extracted from a remote rock outcrop in Australia, the picture of how our planet became habitable to life about 4.4 billion years ago is coming into sharper focus.
Fuente : http://www.eurekalert.org/pub_releases/2014-02/uow...
Fuente : http://www.eurekalert.org/pub_releases/2014-02/uow...