Answer · confidence: partial
What rules stop germs moving between Mars and Earth, and who protects the crew?
Research question: What rules exist to prevent contaminating Mars or Earth with microbes, and who sets the standards for crew safety and consent?
The records show that COSPAR, a non-governmental organization created in 1958 by the ICSU, issued an updated planetary protection policy in 2002 as the framework for preventing biological contamination of planets 95. Its policy aims to ensure adherence to the 1967 Outer Space Treaty, and its guidelines are not legally binding but are globally supported and come with implementation instructions 68. Under Article XI of the Outer Space Treaty, states must disclose the nature, conduct, locations and results of their space activities, and NASA requires Restricted Earth Return sample-return missions to contain any potential indigenous life form 1210. The verified facts do not say who sets standards for crew safety or consent, so that part of the question remains unanswered. The newest facts date from 2026, the same year as today 681113.
Checked 2026-10-14. Only documented and supported facts are used.
Dig deeper on this questionSources
[1] supported
The document says that, as with conservation work on Earth, planetary protection would have to be addressed to prevent biological contamination of Mars.
"and much like conservation work on Earth, we would have to address the issue of planetary protection."Mars: contamination, planetary protection and the search for life (2015)
[2] supported
The National Academy of Sciences of the USA and the European Space Sciences Committee produced a report identifying potential "special regions" on Mars that may need special testing for life.
"the National Academy of Sciences of the USA and the European Space Sciences Committee have already produced a report foreseeing potential “special regions” of interest apart from sources of briny water, including methane-rich areas, shallow ice-rich deposits and subsurface cavities such as caves."Mars: contamination, planetary protection and the search for life (2015)
[3] supported
Earth microbes could in principle hitch a ride to Mars as microscopic stowaways and survive on the Martian surface.
"Earth extremophiles could, in principle, accidentally make the whole journey to Mars as microscopic stowaways and survive on the Martian surface."Mars: contamination, planetary protection and the search for life (2015)
[4] supported
Rovers such as Opportunity and Curiosity might be judged unfit to travel to biologically promising areas because of the risk of microbial contamination from Earth.
"which might be deemed unfit to travel to biologically promising areas due to the hazard of microbial contamination from Earth."Mars: contamination, planetary protection and the search for life (2015)
[5] supported
The Committee on Space Research (COSPAR) issued an updated planetary protection policy in 2002, which is the framework the source addresses for preventing biological contamination of planets.
"An updated planetary protection policy for COSPAR (2002)"An updated planetary protection policy for COSPAR (2002)
[6] documented
The COSPAR Policy on Planetary Protection aims to ensure adherence to the 1967 Outer Space Treaty.
"To ensure safe and sustainable scientific exploration of these bodies, the COSPAR Policy on Planetary Protection aims at ensuring adherence to the 1967 Outer Space Treaty."The COSPAR Panel on Planetary Protection and the COSPAR Policy on Planetary Protection: an overview of governance and activities (2026)
[7] supported
COSPAR set up a Planetary Protection Panel to consider forward and back contamination, the two directions of microbial contamination between Earth and other celestial bodies.
"It has established the Planetary Protection Panel (PP Panel) to consider matters of forward and back contamination."The COSPAR Planetary Protection Policy and International Law (2023)
[8] documented
The COSPAR planetary protection guidelines are not legally binding, but they are globally supported and come with implementation instructions.
"Although not legally binding, the guidelines set forth by the Policy are globally supported, with implementation instructions provided."The COSPAR Panel on Planetary Protection and the COSPAR Policy on Planetary Protection: an overview of governance and activities (2026)
[9] supported
COSPAR is a non-governmental organization that was created in 1958 by the International Council of Scientific Unions (ICSU), now the International Science Council.
"COSPAR is an international, non-governmental organization composed of national scientific institutions and international scientific unions, created in 1958 by the International Council of Scientific Unions (ICSU), now known as the International Science Council (ISC)."The COSPAR Planetary Protection Policy and International Law (2023)
[10] documented
NASA requires sample-return missions with a Restricted Earth Return categorization to include additional measures to contain any potential indigenous life form so it cannot harm humans or Earth's environment.
"NASA requires such a mission to include additional measures to ensure any potential indigenous life form would be contained so it could not adversely impact humans or Earth's environment."Procedures for Implementing the National Environmental Policy Act (National Aeronautics and Space Administration, 2024-04-11)
[11] documented
The COSPAR Panel on Planetary Protection's primary goal is to guard against the harmful effects of both forward and backward contamination.
"The primary goal of the Committee on Space Research (COSPAR) Panel on Planetary Protection is to safeguard against the harmful effects of both forward and backward contamination."The COSPAR Panel on Planetary Protection and the COSPAR Policy on Planetary Protection: an overview of governance and activities (2026)
[12] supported
Under Article XI of the Outer Space Treaty, states are obligated to disclose the nature, conduct, locations and results of their space activities.
"Article XI of the OST obligates States to disclose the nature, conduct, locations and results of their activities in space."The COSPAR Planetary Protection Policy and International Law (2023)
[13] supported
The COSPAR Policy is regularly reviewed and revised to reflect new scientific discoveries and the changing requirements of space exploration.
"The Policy is regularly reviewed and revised to incorporate the latest scientific discoveries, alongside the rapidly advancing requirements of space exploration."The COSPAR Panel on Planetary Protection and the COSPAR Policy on Planetary Protection: an overview of governance and activities (2026)
[14] supported
Spacecraft sent to explore other celestial bodies could carry biological material that might contaminate pristine natural environments and compromise scientific investigations.
"Spacecraft sent to explore our celestial neighbors could carry biological material that could contaminate the pristine natural environments and jeopardize the integrity of scientific experiments and investigations."The COSPAR Planetary Protection Policy and International Law (2023)