It is their cheese
Hm. You know, I guess it is illegal to visit the moon without permission. From the 1979 Agreement Governing the Activities of States on the Moon and Other Celestial Bodies (original): Article 14 1. States Parties to this Agreement shall bear international responsibility for national activities on the moon, 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 this Agreement. States Parties shall ensure that non-governmental entities under their jurisdiction shall engage in activities on the moon only under the authority and continuing supervision of the appropriate State Party. ...