For billions of years, the Earth and the Moon have danced together. Since the Apollo era, scientists have used lasers — a technology then in its infancy — to measure their waltz. Lasers have since played increasingly important roles in spaceflight. They may even play a part in keeping the next generation of lunar astronauts connected to home.
Click here for original story, ‘The Invisible Network’ Podcast – Episode 11: Reflections
Source: NASA Goddard Center