Abstract
Science fiction has proposed many scenarios of humans inhabiting other planets, but those were created for entertainment. As humans continue to release greenhouse gases into the atmosphere, Earth’s surface temperature rises and the environment changes. The direction of these changes suggest that humans will need to find another place to live in order to survive, but our current solar system doesn’t have any immediate options. This paper discusses two methods of making planetary bodies such as Mars, Venus, Luna, and Ceres inhabitable: terraforming and Shell World construction. The time requirements, ethical considerations, and material requirements for both methods are examined in an attempt to select the best method for future inhabitation of other planets.