The number of galaxies in the observable universe = **10^12**

10000000000000

The number of grains of sand to fill an average office = **5×10^13**

50000000000000

Meters from the earth to the edge of the observable universe = **4.3×10^26** (46 billion light years )

4300000000000000000000000000

Meters in the observable universe = **8.8×10^26** (92 billion light years)

8800000000000000000000000000

The number of particles (baryons) in the observable universe = **10^80**

10000000000000000000000000000000000000000000000000000000

00000000000000000000000000

The number of grains of sand to fill the observable universe = **10^90**

10000000000000000000000000000000000000000000000000000000

000000000000000000000000000000000000

A googol = **10^100**

10000000000000000000000000000000000000000000000000000000

0000000000000000000000000000000000000000000000

The number of possible chess games (Shannon’s Number) = **10^123**

10000000000000000000000000000000000000000000000000000000

00000000000000000000000000000000000000000000000000000000

0000000000000

Number of plank volumes in the observable universe = **10^183**

100000000000000000000000000000000000000000000000000000000000

000000000000000000000000000000000000000000000000000000000000

000000000000000000000000000000000000000000000000000000000000

00000

A googolplex = **10^(googol)**

[there is not enough space in the universe to write this number down, even if each digit were the size of a subatomic particle]

Graham’s number =** ?**

(This number, the solution to a real, applied math problem, is too large for scientific notation so we need to invent a new way to write it down)

let us say that 3^^3 = 3^3^3 = 7625597484987 (a puny number in our collection)

such that 3^^^3 = 3^^3^^3 = 3^^7625597484987 = 3^3^3^3^3^….^3

where the number of 3’s in the stack is = 7625597484987

(note: if we were to calculate this tower of powers of 3 (which is 7 trillion 3’s tall)

even the number of digits in this number would be way more than a googleplex)

and so, 3^^^^3 = 3^^^3^^^3 = 3^^^(3^^7625597484987) = 3^^3^^3^^…^^3

where the number of 3’s in this new stack is = 7625597484987

(remember, each 3^^3 = 7625597484987)

so now we are talking about the number:

7625597484987^7625597484987^…^7625597484987^7625597484987

where this stack of powers of 7625597484987 is 7625597484987 high

now, let us call this last number g1, such that g1 = 3^^^^3

and then let us say that g2 = 3^^^…n…^3 where (n) = g1

and that g3 = 3^^^…n…^3 where (n) = g2

and so on…

such that Graham’s Number = **g64**

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