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How Big is it?
Who Thought of it?
How Do You Write it?


A 'googol-plex' - A number equal to the number 1, followed by a 'googol' of zeros. A 'googol' is the number 1 followed by 100 zeros!



A kid! That's right, back in 1938, Edward Kasner's nine year old nephew, Milton Sirotta, coined the term googol which is 10100, then proposed the further term googolplex to be "one, followed by writing zeroes until you get tired".

Kasner decided to adopt a more formal definition "because different people get tired at different times and it would never do to have a commoner be a better mathematician than Dr. Einstein, simply because he had more endurance and could write for longer". It thus became standardized to 1010100.


In the PBS science program Cosmos: A Personal Voyage, (episode 9):

"The Lives of the Stars", astronomer and television personality Carl Sagan estimated that writing a googolplex in standard form (i.e., "-10,000,000,000...") would be physically impossible, since doing so would require more space than the known universe provides.

An average book of 60 cubic inches can be printed with 5×105 zeroes (5 characters per word, 10 words per line, 25 lines per page, 400 pages), or 8.3×103 zeros per cubic inch. The observable (i.e. past light cone) universe contains 6×1083 cubic inches (4/3 × π × (14×109 light years in inches)3).

This math implies that if the universe is stuffed with paper printed with 0s, it could contain only 5.3×1087 zeros—far short of a googol of zeros.

In fact there are only about 2.5×1089 elementary particles in the observable universe, so even if one were to use an elementary particle to represent each digit, one would run out of particles well before reaching a googol digits.

Consider printing the digits of a googolplex in unreadable, one-point font (0.353 mm per digit). It would take about 3.5×1096 meters to write a googolplex in one-point font.

The observable universe is estimated to be 8.80×1026 meters, or 93 billion light-years, in diameter, so the distance required to write the necessary zeroes is 4.0×1069 times as long as the estimated universe.

The time it would take to write such a number also renders the task implausible: if a person can write two digits per second, it would take around about 1.51×1092 years, which is about 1.1×1082 times the age of the universe, to write a googolplex.

A Planck space has a volume of a Planck length cubed, which is the smallest measurable volume, at approximately 4.222×10−105 m3 = 4.222×10−99 cm3. Thus 2.5 cm3 contain about a googol Planck spaces. There are only about 3×1080 cubic metres in the observable universe, giving about 7.1×10184 Planck spaces in the entire observable universe, so a googolplex is far larger than even the number of the smallest measurable spaces in the observable universe.


In our physical universe One googol is presumed to be greater than the number of hydrogen atoms in the observable universe, which has been variously estimated to be between 1079 and 1081.

A googol is also greater than the number of Planck times elapsed since the Big Bang, which is estimated at about 8×1060.

Therefore, in our physical world it is difficult to give examples of numbers that compare to the vastly greater googolplex.

In analyzing quantum states and black holes, physicist Don Page writes that "determining experimentally whether or not information is lost down black holes of solar mass ... would require more than 1076.96 measurements to give a rough determination of the final density matrix after a black hole evaporates". The end of the Universe via Big Freeze without proton decay is expected to be around 101075 years into the future, which is still short of a googolplex.

In a separate article, Page shows that the number of states in a black hole with a mass roughly equivalent to the Andromeda Galaxy is in the range of a googolplex.

If the entire volume of the observable universe (taken to be 3 × 1080 m3) were packed solid with fine dust particles about 1.5 micro-metres in size, then the number of different ways of ordering these particles (that is, assigning the number 1 to one particle, then the number 2 to another particle, and so on until all particles are numbered) would be approximately one googolplex.


OK, first get enough ink to fill the earth's oceans 1,000 X 10 to tenth power times. Then get enough paper to cover the entire Milky Way. Next, find a place larger than our universe, and then . . . (Wait! - We can't do that . . hmmm).

Guess it will have to wait until we find a bigger place, eh?

OK, so instead let's just watch Yusuf Estes (Guide US TV) and Dr. Mohamed Salah (Huda TV) doing some STREET DAWAH IN HONG KONG:

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