![](https://www.frostscience.org/wp-content/uploads/2019/10/corner-cube-reflector-sm.jpg)
The Apollo Program Laser Ranging Retroreflector experiment uses a special type of mirror, called a corner-cube reflector, to measure the distance between the Earth and the Moon. This experiment is still active after 50 years!
The Apollo Program Laser Ranging Retroreflector experiment uses a special type of mirror, called a corner-cube reflector, to measure the distance between the Earth and the Moon. This experiment is still active after 50 years!