Which country is still responsible for a private company's crew on Mars?
Research question: Under the Outer Space Treaty, which government stays legally responsible for a private company's crew on Mars?
The treaty's general rule is that States Party bear international responsibility for national space activities, whether carried out by governments or non-governmental entities 1. Private activities, including those on the Moon and other celestial bodies, require authorization and continuing supervision by the appropriate State Party 3. The records show that these authorization and supervision mechanisms are what engage and maintain State responsibility over time, but they do not name which specific government would bear responsibility for a private company's crew on Mars 6. The facts therefore only partly answer the question, pointing to the authorizing and supervising state without identifying one for a Mars mission 136. The newest facts date from 2026, so this reflects material current as of October 2026 246.
Sources
"States Party shall bear international responsibility for national space activities whether carried out by governmental or non-governmental entities"Outer Space Treaty
"While the Outer Space Treaty of 1967 prohibits national appropriation of outer space and celestial bodies, it simultaneously permits states to authorize and supervise non-governmental activities under Article VI."<p>Private Space Exploration and the Limits of the Outer Space Treaty</p> (2026)
"the activities of non-governmental entities in outer space, including the Moon and other celestial bodies, shall require authorization and continuing supervision by the appropriate State Party to the Treaty"Outer Space Treaty
"This dual structure has enabled the rise of national legislative regimes permitting private entities to extract, possess, transport, use, and sell space resources under state authorization, while formally maintaining adherence to the principle of non-appropriation."<p>Private Space Exploration and the Limits of the Outer Space Treaty</p> (2026)
"the state that launches a space object, such as a satellite or space station, retains jurisdiction and control over that object"Outer Space Treaty
"It distinguishes authorization as a prospective legal function from supervision as a continuing obligation and clarifies their roles in engaging and maintaining State responsibility over time."State Governance for an Emerging Space Nation Working Paper No. 2: Authorization and Continuing Supervision Under Article VI of the Outer Space Treaty (2026)
"The Commission also recognizes that the United States' regulatory regime for achieving compliance with its obligations under Article VI of the Outer Space Treaty contemplates multiple agencies authorizing and supervising the activities of non-governmental entities in space."Space Innovation; Facilitating Capabilities for In-Space Servicing, Assembly, and Manufacturing (Federal Communications Commission, 2024-03-15)