How many baryons are there in the universe?

franoisbelfor

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

George Jones

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.

Nabeshin

Coors Cosmology, I like it.

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?

George Jones

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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franoisbelfor	How many baryons are there in the universe? Tweet 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

George Jones Mentor	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.

Nabeshin Recognitions: Science Advisor	Coors Cosmology, I like it.

Chronos Recognitions: Gold Member Science Advisor	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?