LARGE NUMBERS: (10^n means that 10 is raised to the n'th power)
10^4 One "myriad". The largest numbers, the Greeks were considering.
10^5 The largest number considered by the Romans.
10^10 The age of our universe in years.
10^22 Distance to our neighbor galaxy Andromeda in meters.
10^23 Number of atoms in two gram Carbon (Avogadro).
10^26 Size of universe in meters.
10^41 Mass of our home galaxy "milky way" in kg.
10^51 Archimedes's estimate of number of sand grains in universe.
10^52 Mass of our universe in kg.
10^80 The number of atoms in our universe.
10^100 One "googol". (Name coined by 9 year old nephew of E. Kasner).
10^153 Number mentioned in a myth about Buddha.
10^155 Size of ninth Fermat number (factored in 1990).
10^(10^6) Size of large prime number (Mersenne number, Nov 1996).
10^(10^7) Years, ape needs to write "hound of Baskerville" (random typing).
10^(10^(33)) Inverse is chance that a can of beer tips by quantum fluctuation.
10^(10^(42)) Inverse is probability that a mouse survives on sun for a week.
10^(10^{51)) Inverse is chance to find yourself on Mars (quantum fluctuations)
10^(10^(100)) One "Gogoolplex", Decimal expansion can not exist in universe.
 from R.E. Crandall, Scient. Amer., Feb. 1997
