Even as momentum builds toward sending humans to Mars in the next decade, several regions on the Red Planet remain off-limits to robotic exploration. The reason has nothing to do with distance or terrain. Instead, it reflects a long-standing international effort to prevent Earth microbes from contaminating potentially habitable zones.
Known as special regions, these areas could offer the best conditions for Mars life detection. No spacecraft, however, is currently authorized to explore them. The restriction stems from planetary protection guidelines that prioritize scientific integrity over operational ambition.
Recent data from NASA’s Perseverance rover in Jezero Crater has intensified the conversation. In 2025, the rover identified organic molecules in rock formations linked to water-rich environments, prompting renewed scrutiny of current exploration limits.
The Legal and Scientific Shield Around Mars’s Special Regions
Special regions are Martian locations where environmental conditions may support microbial life. These include areas with intermittent warmth or subsurface water. The Committee on Space Research (COSPAR) sets the criteria: any zone with temperatures above –28°C and water activity above 0.5 is flagged for protection.
The policy draws legal weight from Article IX of the 1967 Outer Space Treaty, which obligates nations to avoid biological contamination of other worlds. COSPAR’s planetary protection policy functions as the global implementation standard, informing mission protocols for agencies such as NASA, ESA, and CNSA.
Hellbound and Down 