How Big Is A Googolplex?
A common estimate of the number of particles in the observable universe is 10 to the power of 80-less than a googol, and less than the number of zeroes in a googolplex. (Admittedly, this estimate does not include photons and dark matter.) Carl Sagan once said that writing out googolplex would be impossible, because the known universe simply doesn't have enough space.
Key Facts In This Video
A googol is 10 raised to the power of 100—in other words, a 1 with 100 zeroes after it. (0:33)
A googolplex is 10 raised to the power of googol. (2:53)
A universe that was a googolplex meters across would likely contain repeated versions of yourself. (3:56)