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You can look on the web at places such as: http://pages.prodigy.net/jhonig/bignum/qauniver.html for estimates of the number of atoms in the observable universe  google 'number of atoms in the universe'. As for numbers of bacteria, that's not my game. The problem we have as humans is that we have no feel for large numbers. If you counted the number of different ways that you could line 20 children up for a school bus, and looked at a different arrangement every second, it would take 7 or 8 billion years to go through them all  roughly about the age of our universe (that's only about 10^{20} seconds). I'm not sure how you arrive at your numbers but certainly there could not be that many bacteria in 72 years  you might need to look at a population and consider a predator  prey model maybe, that is, not all bacteria can continue to divide repeatedly I suspect. Penny  


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