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National Geographic Documentary - Mars Underground Space Station on Mars - Documentary 2015 Full HD Space Documentary 2015 -THE RED PLANET MARS - National Geographic Documentary, nasa documentary mars, science documentary ... bbc documentary, bbc science, bbc space, space, documentary,UFO, Alien, army, war, discovery chanel, discovery UFO, UFO documentary, space UFO, history ... mars documentary 2015, mars documentary national geographic, mars documentary discovery channel, mars documentary bbc, mars documentary in hindi, ... BBC Documentay, HD Documentary, Full Documentary documentary films, documentary films english subtitles, documentary films national geographic, ... mars exploration documentary, mars expedition documentary, mars exploration 2013 documentary, mars express documentary, mars documentary full, face on ... Unive National Geographic Documentary - Mars Underground Space Station on Mars - Documentary 2015 Full HD National Geographic Documentary - Mars Underground Space Station on Mars - Documentary 2015 Full HD https://youtu.be/vhZpUiSIqqI National Geographic Documentary - Mars Underground Space Station on Mars full - Documentary 2015 Full HD. Mars is the focus of much speculation and scientific study about possible human colonization. Its surface conditions and the likely presence of water on Mars make it arguably the most hospitable of the planets, other than Earth. Mars requires less energy per unit mass (delta-v) to reach from Earth than any planet except Venus. However, at minimum energy use, a trip to Mars requires 6–7 months in space using current chemical spacecraft propulsion methods. Mars Direct is a proposal for a human mission to Mars that is designed to be both cost-effective and possible with current technology. It was originally detailed in a research paper by NASA engineers Robert Zubrin and David Baker in 1990, and later expanded upon in Zubrin's 1996 book The Case for Mars. It now serves as a staple of Zubrin's speaking engagements and general advocacy as head of the Mars Society, an organization devoted to the colonization of Mars. On July 20, 1989, George H. W. Bush – then President of the United States – announced plans for what came to be known as the Space Exploration Initiative (SEI). In a speech on the steps of the National Air and Space Museum he described long-term plans which would culminate in a manned mission to the surface of Mars. By December 1990, a study to estimate the project's cost de