"Robert Ehrlich" wrote in message
news:sOT_a.146653$YN5.96279@sccrnsc01...
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| The many photos of footprints made by astronauts, or by the
| bounce marks of a landing strut also testify to the cohesiveness
| of lunar soil.

Of course. Compression from footprints or strut impacts creates energy in
the rubbing together of particles which, in the absence of a patina, "welds"
the particles together.

| BTW what is the grain size of the particles contaminating the optics?

Unknown, since it was observed only and never sampled. But consistent with
being held against the lens surface by electrostatic charge. This effect
was anticipated.

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The universe is not required to conform | Jay Windley
to the expectations of the ignorant. | webmaster @ clavius.org