SPEM strongly advocates for the foundation of extensive planetary preserves and reserves wherein the diversity of exobiological life, undisturbed, may endure in its natural environment. Stewardship of these extraterrestrial environments for future generations is an essential goal of the SPEM initiative. We are committed to hygiene, quarantine, and pack-in-pack-out principles for all interplanetary expeditions. New legal regimes are crucial to these novel preserves, and the SPEM “Pro-Tem Consortium for Astrobiological International Law” is actively working on these issues. See “Get Involved!” for more information.