Edward Gisske wrote:
>=20
> Didn't we leave a retro-reflector up on the moon on one of the last=
 trips?
> It might be fun to illuminate that again.
> Ed

Yes, several. And regularly used (see last link).

http://tmo.jpl.nasa.gov/tmo/progress_report/42-131/131D.pdf

Phase I of the Compensated Earth{Moon{Earth Retrorereflector=20
Laser Link (CEMERLL) experiment
demonstrated the first propagation of an atmosphere-compensated=20
laser beam to the lunar retrore=B0ectors.

http://www.bga.com/~cfb/Using_Lunar_Retroreflectors.html
Relative Signal Strengths Using Lunar Retroreflectors=20

http://www.csr.utexas.edu/mlrs/mlrs.html
http://www.csr.utexas.edu/mlrs/pictures/lunar_ra.jpg

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