Apollo astronauts left mirrors on the moon decades ago; scientists are still firing lasers at them, here's why

Apollo 15's lunar retroreflector continues to aid scientists with precise measurements. This device, left on the Moon in 1971, reflects laser light sent from Earth. Scientists measure the Earth-Moon distance to centimeter-level accuracy using this equipment. These measurements help determine the Moon's orbit and test gravitational theories. This Apollo experiment remains a valuable scientific tool decades after its deployment.

Raccontata daeconomictimes.indiatimes.com