The Apollo astronauts left mirrors on the Moon that scientists still bounce lasers off 57 years later, and the round-trip measurement is precise enough to track the Moon drifting away from Earth at the speed your fingernails grow

AI Summary

Apollo astronauts placed retroreflectors on the Moon that still allow scientists to bounce lasers for precise measurements. These measurements have tracked the Moon drifting away from Earth at a rate comparable to human fingernail growth over 57 years.

The retroreflectors left on the Moon by Apollo 11, 14, and 15 still return laser pulses fired from Earth, and 57 years of data have measured ...