# How many galaxies are in the universe?

Incidentally the reason the number of atoms was estimated was due to the Shannon Number, which was the estimated number of possible chess games you can play based on an average game length of 40 pairs of moves. The Shannon number is usually estimated to be in the realm of ${10}^{120}$ . By comparison the total number of estimated atoms in the known universe is between ${10}^{79}$ to ${10}^{81}$.