A robust and growing commercial space sector is moving ahead at warp speed. While the industry today primarily offers satellite and launch services, tomorrow will bring manufacturing, research and development, resource extraction, and space tourism. What do these developments mean for the earth’s biosphere, as well as for the environments of other celestial bodies finally within humanity’s reach? This is the role of planetary protection, the principle of safeguarding both terrestrial and extraterrestrial environments from humanity’s propensity for introducing pollution into any habitat.

The Oak Ridge Reservation is one of the largest U.S. Department of Energy (DOE) facilities in the country, with areas that are highly contaminated by chemicals, metals, and radionuclides. DOE is in the middle of a multi-decade, multi-billion-dollar cleanup there, and a recent Superfund decision for one portion of the site raises a number of significant legal issues. This Article addresses some related questions: Should radionuclides get less stringent cleanup than other equally harmful pollutants like mercury and polychlorinated biphenyls?