Part 8/10:
Physical Samples: The Apollo missions returned with 382 kilograms of lunar rocks, which have been studied worldwide and are distinct from Earth rocks, having unique isotopic compositions.
Retroreflectors: Instruments installed on the lunar surface during Apollo missions are still used today to bounce laser beams from Earth, allowing precise measurements of the Earth-Moon distance.
Telemetry Data: NASA holds extensive telemetry and mission logs, detailing every phase of the missions.
Independent Tracking: Countries like the Soviet Union, which was competing in the space race, tracked the Apollo missions and confirmed their authenticity.