Final answer:
The moon's interior was studied by measuring seismic waves generated by moonquakes, utilizing a seismometer placed on the Moon, much like how seismic waves are used to study Earth's interior.
Step-by-step explanation:
The moon's interior was studied by measuring the transmission of seismic waves through its materials, similarly to how Earth's interior is studied. These seismic waves are generated by moonquakes, which, although less frequent and of lower magnitude than earthquakes on Earth, still provide valuable data. A seismometer was placed on the Moon to capture this information. By analyzing how these waves travel through the Moon's interior, scientists can infer details about its composition and structure. Additionally, metal foils were used to capture solar wind particles, and corner reflectors were installed for precise laser distance measurements, contributing further to our understanding of the Moon.