[Laser] Lunar Laser EDM

[Tom Becker]

"Earth's atmosphere distorts the beam so that it is expanded out to 1.25 
miles in diameter when it hits the Moon. Only one in 30 million of the 
original photons in the beam actually will hit the retroreflector. By 
the time the light makes it back to Earth, the beam will have expanded 
to 9.3 miles in diameter. Of the returning photons, only one in 30 
million will hit the telescope on Earth."

http://www.spacetoday.org/SolSys/Moons/LunarProspector.html


Tom