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The american mathematician Edward Kasner once asked his nine-year-old nephew to invent a name for a very large number, ten to the power of one hundred; and the boy called it a googol. He thought this was a number to overflow people's minds, being bigger than anything that can ever be put into words. Another mathematician then shot back with Googolplex, and defined it to be 10 to the power of Googol, proving poor old Edward wrong in an instance.
At least I have to admit that this number is truly unbelievable. A Googol is nothing special; the total number of elementary particles in the known universe is about 10 to the power of 80. If this space was packed solid with neutrons, so there was no empty space anywhere, there would be about 10 to the power of 128 particles in it. This is quite a lot more than a Googol. But you simply cannot express the kind of Googolplex's numerical dimension with terms other than “10 to the power of something”.
Note: Or can you? Physicist Don Page mailed me a text with a relatively simple description of how to imagine a value equivalent to Googolplex.
In print, a Googol also looks quite uninteresting. It is a 1 followed by 100 zeroes. It's boring. Now a Googolplex has a 1 followed by 10 to the power of 100 zeroes.
10 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000
This is a Googol. See, there's nothing to it.