A State Party that learns of the forced landing, forced landing or other accidental landing on the moon of a space object or its non-derivative constituents immediately informs the state part that has crashed and the Secretary-General of the United Nations. The treaty was concluded in 1979 and came into force in 1984 for the ratifying parties, after fulfilling the requirement that 5 states were ratified. Since January 2019, 18 states have been parties to the treaty, seven of which have ratified the agreement and the rest have entered into membership.   Four other states have signed the treaty but have not ratified it.   The L5 Society and others successfully refused ratification of the treaty by the U.S. Senate.   (a) Land their space objects on the Moon and launch them from the Moon; 2. When a State party knows that another State party intends to operate simultaneously on the same territory or in the same orbit around or around the Moon, it immediately informs the other State of the date and plans of its own operations. All activities on the Moon, are applied in accordance with international law, in particular to the Charter of the United Nations, and in view of the Declaration on the Principles of International Law on Friendly Relations and Cooperation between States, in accordance with the Charter of the United Nations adopted on 24 October 1970 by the General Assembly in the interest of maintaining international peace and security and promoting international cooperation and mutual understanding, properly regarded by the interests of all parties. Recalling in particular that it approved, in resolution 33/16, the recommendation of the Committee on the Peaceful Uses of Outer Space that, at its eighteenth session, the Legal Subcommittee should, as a matter of priority, continue its efforts to complete the draft treaty on Moon 1. Any State party can ensure that the activities of other States Parties in the exploration and use of the Moon are compatible with the provisions of this Convention.