Home > Astronomy > Scale of Earth, Sun, Galaxy, and Universe

How many galaxies are in the universe?

Answer 1

We can only answer regarding the known universe.

The estimated number of galaxies in the known universe is between 100 and 200 billion, based on the estimated number of atoms 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#.

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Answer 2

Hazel Asher

Although the precise count of galaxies in the universe is unknown, estimates place the number at over 100 billion.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.