Valles Marineris: Grand Canyon ya Mars Julai 3, 2014 By Kuchunguza nafasi Kushiriki huu:Valles Marineris: Grand Canyon ya Mars http://t.co/G2gqXSVAzV #nk #Machi #Viking #USGS #katika pic.twitter.com/quzAiAebEy — Kuchunguza nafasi (ObservingSpace) Mei 11, 2014 Kushiriki huu: