Well, here is a straight-forward translation of the message,
and I'll put comments later...

'large' is not 'small'
'small' is not 'large'
'dimension ;' of infinity is 45 ';' units
'dimension ;' of 0 is 0 ';' units
'dimension ;' of the TC star is 82296 ';' units
'dimension ;' of the first planet is 4392 ';' units

'x' is not '4'
'4' is not 'x'
'x' is a 'xzx' (star)
'4' is part of infinity
'7' is a large speed
'8' is a small speed
'7' is not '8'
'8' is not '7'
G
'?B?' is ...
	. . .
       . . . .
      . . O . O
       . O O .
        . . .
what is 'dimension [' of '?B?'
the 'dimension [' of '?B?' is 1837.12406 '[' units
']' is ...
        . . .
       . . . .
      . . O . .
       . O O .
        . . .
'{' is ...
        . . .
       . . . .
      . . . . O
       . . . .
        . . .
the 'dimension [' of ']' is 1836.12406 '[' units
the 'dimension [' of '{' is 1 '[' units
'{' + ']' make up '?B?'
G
infinity is part of '3'.

Ok, this message does some help to verify earlier guesses.  
A couple proposals:
';' is volume.  If you compare the cube roots of the
two numbers associated with the star and the first 
planet, you get about 2.65, and looking at the hex-raster
image of theie solar system, this is about the relative
size of big object and the small object.  Now, the
only problem is why is the volume of infinity equal 
to 45 ?  (42 maybe, but not 45 :-)

'x', '4', '7', '8' and '3' are more words.  I have no
idea at this point.

the last part is interesting.  We have two objects,
']' and '{' that make up a whole object '?B?'.  We
also get a new unit '['.  At first, I though this might be
a planet and its moon, but the larger object isn't 
spherical.  Then the fact that the larger object is
1836.12406 '[' units and the smaller object is 1 '['
units.  That latter fact would seem to indicate that
the smaller object is their basis for measurement
os '['.  But we have already covered time, length, speed,
and unitless units, and potentially volume, so the only
thing that I can think of at this point is mass, but
there is not enough info to go on this.

Another thought just came to me, but it may be wrong...
';' may also represent temperature.  If 'm' is taken as
'space', then 45 temperaure units would be really small
and it is well known that there does exist some small 
temperature in space.  But then the first planet has a 
temperature that is only 20 times less than that of
the sun.  Even in our solar system, Mercury has a much
lower temperature than the sun.  Its very unlikely this
is the case, but maybe it'll brainstorm off someone else.

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