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>> I will admit I don't know much about the geometry of our galaxy, but I
>> was under the impression that the disk is hundreds of billions of
>> light years "thick",
>
> It's much smaller than you think:
>
> http://en.wikipedia.org/wiki/Milky_way
Heh, "only" 100,000 light years across and 1,000 light years thick.
Well, that's the trouble when you start dealing with Really Huge
Numbers, see?
There's a reason why would talk about 4 Terabytes rather than
4,000,000,000,000 bytes - it's frighteningly easy to get the number of
digits wrong! ;-)
Obligatory XKCD:
http://xkcd.com/558/
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