Ronald Bailey on Putting Men on Mars

Does Mars have rights? The 1967 Outer Space Treaty requires spacefaring nations to conduct exploration of the moon and other celestial bodies "so as to avoid their harmful contamination and also adverse changes in the environment of the Earth resulting from the introduction of extraterrestrial matter." The goal of the treaty is to prevent both back contamination (the introduction of extraterrestrial life to Earth) and forward contamination (the introduction of Earth life to extraterrestrial environments). From our February issue, Science Correspondent Ronald Bailey makes the ethical case for terraforming the Red Planet.