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Colonization of the outer Solar System : ウィキペディア英語版 | Colonization of the outer Solar System
Many parts of the outer Solar System have been considered for possible future colonization. Most of the larger moons of the outer planets contain water ice, liquid water, and organic compounds that might be useful for sustaining human life.〔G.J. Consalmagno, ''Ice-rich moons and the physical properties of ice'',Journal of Physical Chemistry, vol. 87, no. 21, 1983, p. 4204-4208.〕〔Ralph Lorenz and Jacqueline Mitton, ''Lifting Titan's veil: exploring the giant moon of Saturn'', Cambridge University Press, 2002〕 Colonies in the outer Solar System could also serve as centers for long-term investigation of the planet and the other moons. In particular, robotic devices could be controlled by humans without the very long time delays needed to communicate with Earth. There have also been proposals to place robotic aerostats in the upper atmospheres of the Solar System's gas giant planets for exploration and possibly mining of helium-3, which could have a very high value per unit mass as a thermonuclear fuel.〔Robert Zubrin, ''Entering Space: Creating a Spacefaring Civilization'', section: Settling the Outer Solar System: The Sources of Power, pp. 158-160, Tarcher/Putnam, 1999, ISBN 1-58542-036-0〕〔Jeffrey Van Cleve (Cornell University) et al., ("Helium-3 Mining Aerostats in the Atmosphere of Uranus" ), Abstract for Space Resources Roundtable, accessed May 10, 2006〕 ==The Jovian system==
The Jovian system in general poses particular disadvantages for colonizing because of its severe radiation environment〔R. Walker Fillius, Carl E. McIlwain, and Antonio Mogro-Campero, ''Radiation Belts of Jupiter: A Second Look'', Science, Vol. 188. no. 4187, pp. 465–467, 2 May 1975〕 and its particularly deep gravity well. Its radiation would deliver about 3,600 rems per day to unshielded colonists on Io and about 540 rems per day to unshielded colonists on Europa. Exposure of approximately 75 rems over a period of a few days is enough to cause radiation poisoning, and about 500 rems over a few days is fatal.〔Robert Zubrin, ''Entering Space: Creating a Spacefaring Civilization'', section: Colonizing the Jovian System, pp. 166-170, Tarcher/Putnam, 1999, ISBN 1-58542-036-0〕
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