In a newly published policy paper, a pair of Canadian scientists warn that the United States is angling to establish itself as the de facto gatekeeper of the moon and other celestial bodies.

Earlier this year, NASA published a new set of rules for lunar mining and other space activities, dubbing the voluntary guidelines the “Artemis Accords.”

Aaron Boley and Michael Byers, authors of the new Science paper, argue that the Artemis Accords are part of a concerted effort by the U.S. and NASA to set a legal precedent for space-based resource extraction.