>> 6.0 10^23 Number of atoms in 12 g of Carbon-12.
> 
> You realize why this number is important, right? :-)

What, Avagadro's number? (Or however the hell you spell it...)

>> 8.1 10^53 Number of elements in The Monster Group.
> 
> I haven't any idea what this is. :-)
> 
> <google>  Oh, see, this is the sort of thing I'd have to spend a day 
> chasing references around to even figure out what this means.

Apparently, there's a class of groups which can be completely classified 
into something like 6 different kinds, except for a small handful of 
unique groups that don't fit this classification. The "monster group" is 
the largest such - and it's frickin' HUGE!

Wait - you know what a group is, right?

>> 4 10^68 Number of H atoms in a "typical" galaxy.
> 
>> 4 10^41 Kg  Mass of a "typical" galaxy.
> 
> 68-23=45 45-3=42. One power of ten missing.

I fail.

>> 3 10^52 Kg  Mass of the observable universe (exluding Dark Matter).
> 
> I wonder if they're just talking about rest mass or what.

I'm fairly sure it's rest mass, yes. Basically, number of atoms times 
mass of an atom.

-- 
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