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Llínea 5: − *{{citar web|url=http://www.nestanet.org/cms/content/welcome|títol=Welcome to NESTA <nowiki>|</nowiki> NESTA<!--Títol generat per bot-->}}, [[National Earth Science Teachers Association]]
sense resum d'edició
*[http://epod.usra.edu/ Earth Science Picture of the Day], a service of [[Universities Space Research Association]], sponsored by [[Goddard Space Flight Center|NASA Goddard Space Flight Center]].
*[http://epod.usra.edu/ Earth Science Picture of the Day], a service of [[Universities Space Research Association]], sponsored by [[Goddard Space Flight Center|NASA Goddard Space Flight Center]].
*[http://tierra.rediris.es/Geoethics_Planetary_Protection/ Geoethics in Planetary and Space Exploration].
*[http://tierra.rediris.es/Geoethics_Planetary_Protection/ Geoethics in Planetary and Space Exploration].
[[Categoria:Ciències de la Terra| ]]
[[Categoria:Ciències de la Terra| ]]