Hi all!
I think we must avoid making summary conclusions about Mercury. It
is an interesing idea about the dust, however, could it be calculated
from the visible reflective light when compared to the Moon? I would
imagine that there is dust, but there might be a good number of
paticles that are like sand since the surface material might me
modified by the heat and the large gravity for the disk size.
Also, remember that only the Moon, Mars and Mercury are bodies on
which humans could land on in the foreseeable future. I think after
the initial couple of Mars expeditions, it is reseasonable to think
Mercury will be in the cards.
In fact, Mercury as an observatory of the Sun, may be more important
to us than Mars because the more we know about the Sun the more we
will will know about its impact on our weather, climate, and other
more immediate things which concern our lives. Mars is nice, but
more for biological and geological advancement possibly that for
actual impact on the way we live.
-Jacques Noel