# How many baryons are there in the universe?

by franoisbelfor
Tags: baryons, universe
 P: 42 Many articles and papers say that 4% of all energy in the universe is baryonic. How many baryons does that make? I do not seem to find any wikipedia article or paper that gives an absolute number. Can anybody help? Thank you! François
 Mentor P: 6,248 Then number of baryons in the observable universe is usually estimated to be about 1080. See, for example, the solution to problem 6.8, http://www.physics.ucsb.edu/~tt/PHYS133/hws5.pdf, from Barbara Ryden's excellent book Introduction to Cosmology.
 Sci Advisor P: 2,193 Coors Cosmology, I like it.
 Sci Advisor PF Gold P: 9,495 How many baryons are there in the universe? Good answer, Nabeshin, whatever that meant. Fran asked for a number, George gave the best current estimate. Do you have a rebuttal or are you just sniping?
Mentor
P: 6,248
 Quote by Chronos Good answer, Nabeshin, whatever that meant. Fran asked for a number, George gave the best current estimate. Do you have a rebuttal or are you just sniping?
The document to which I linked calculates the number, and after the calculation writes:

"*COORS COSMOLOGY*
The number of baryons in the observable universe is roughly equal to the number of
baryons in a bottle of beer, cubed."

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