High Quality Content by WIKIPEDIA articles! The colonization of Mars by humans is the focus of serious study because surface conditions, such as the availability of frozen ground water, make it the most hospitable planet in the solar system other than Earth. While the Moon due to its close proximity has been proposed as the first location for human colonization, lunar gravity is only 16% that of Earth`s while Martian gravity is a more substantial 38%. There is more water present on Mars than the Moon, and Mars has a thin atmosphere. These factors give Mars a greater potential capacity to host organic life and human colonisation.