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 - Space Daily

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 Space Daily