Concept:
The Moon Treaty, officially known as the Agreement Governing the Activities of States on the Moon and Other Celestial Bodies, is an international treaty adopted by the United Nations to regulate the peaceful exploration and use of the Moon and other celestial bodies.
• Adopted by the UN General Assembly.
• Promotes peaceful use of outer space.
• Prohibits national ownership of the Moon.
Step 1: Understand the objective of the Moon Treaty.
The treaty ensures that:
The Moon and other celestial bodies are used only for peaceful purposes.
It also encourages international cooperation in space exploration.
Step 2: Recall the adoption year.
The United Nations General Assembly adopted the Moon Treaty in:
\[
1979
\]
It later entered into force on:
\[
11 \text{ July } 1984.
\]
Step 3: Compare the options.
Among the given years:
\[
1979,\;1982,\;1989,\;1966
\]
the correct adoption year is:
\[
1979
\]
Step 4: Final conclusion.
Hence, the correct answer is:
\[
\boxed{1979}
\]