Lunar Moon Meteorite

Probability of hitting asteroid or meteorite the "Lunar Laser retroreflector array"?

I was wondering what will be the probability of a "Asteroid or Meteorite" hitting and destroying the "Lunar Laser retroreflector array" left by Apollo 11, Apollo 14 and Apollo 15.
As moon has no atmosphere and is hit constantly See http://science.nasa.gov/headlines/y2006/13jun_lunarsporadic.htm so my question is for the experiment
http://en.wikipedia.org/wiki/Lunar_Laser_Ranging_Experiment
how the lasers are still working ? and how are they protected.
my question is

How can those mirrors be safe for so long, what about the moon dust?

the lasers are here on Earth... on the moon is only mirrors.... to reflect the light of the lasers back to Earth..... since they've been fine for over forty years, I don't see anything bothering them for forty more at least.....




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