How did the Apollo missions advance knowledge of the Moon’s geology?

The Apollo missions revolutionized our understanding of the Moon by providing direct samples and on-site observations that confirmed it is an evolved body with a complex history of differentiation and volcanic activity.12

Key geological insights gained include:

• Crustal History: Unlike Earth, the lunar crust is not recycled by tectonic processes, allowing it to preserve ancient records. Radiometric age dating of highland rock samples revealed they are nearly four billion years old, indicating the crust solidified shortly after the planets formed from the solar nebula.12
• Volcanism: Analysis of mare basalts showed that volcanic outpourings occurred long after the highlands formed, likely driven by internal radioactive heating rather than primordial heat.12
• Surface Observations: Beyond sample collection, astronauts conducted geologic observations, took photographs, and deployed long-lived instrument arrays. Orbital Command and Service modules also utilized remote-sensing instruments to gather critical compositional data.2