Article VI of the 1967 U.N. Outer Space Treaty, which was ratified and is currently in effect, clearly covers this subject:
"States Parties to the Treaty shall bear international responsibility for national activities in outer space, including the moon and other celestial bodies, whether such activities are carried on by governmental agencies or by non-governmental entities, and for assuring that national activities are carried out in conformity with the provisions set forth in the present Treaty. 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."
You may read the entire text of the treaty on the United Nations website.
Clint Bradford, K6LCS / KAF3359 909-241-7666