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The Super Duper Black Hole
The proton is apparently stable, but it actually seems very likely that the additional physics beyond the standard model will cause the proton decay. This means in 10 to the 40 years, all your white dwarfs and neutron stars will be half the size. Now for every nucleon that exists now, only 10 to the minus 30 will be left. So by 10 to the 43 years we have two to the minus 1,000th of the number of nucleons left.