Universe Word Problem: How big is "10^10^123 power"?

Curses. I just wasted an hour lost in wiki land.
Some of my colleagues use Fermi paradox as an example for estimation problems. I think that is complicates the study of estimation problems more that needed.
 
I like Fermi estimates generally, particularly with error bounds, mostly because many of the problems I have dealt with have weak data.
 
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