USA Sending Retroreflectors On International Lunar Missions 

 NASA Laser Retroreflectors Are On Two Upcoming Lunar Landings, Israel Beresheet (L) Scheduled For 11 April And India Chandrayaan-2 (R) Launching Apr; Unpowered Laser Reflectors Will Be Useful For Lunar Navigation, Measuring The Moon’s Changing Distance From Earth And Fundamental Physics; Retroreflectors Left By 3 Apollo And 2 Russia Luna Landings Still Returning Science; Apollo Lunar Laser Ranging Experiment Reports The 384,402-km Earth-Moon Distance Increasing By 3.82 cm/yr, An Anomalously High Figure That May Indicate The Speed Of Light Changing

Credits: NASA, SpaceIL, ISRO