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zaman786
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- how do we calculated the number of atoms at the start , after big bang?
hi, how do we calculated the number of atoms at the start of universe i.e, after big bang?
Technically, atoms couldn't form and remain stable until the recombination epoch, about 380,000 years after the Big Bang. Some of the best evidence for the Big Bang theory itself, comes from the analysis of the expected proportion of light elements during this initial phase of nucleosynthesis.zaman786 said:TL;DR Summary: how do we calculated the number of atoms at the start , after big bang?
hi, how do we calculated the number of atoms at the start of universe i.e, after big bang?
Wikipedia says 0.25 per cubic meter in the observable universe.Vanadium 50 said:Are you sure?
Their references areIn the observable universe, atoms have an average density of 0.25 atoms/m³. According to the Big Bang model (Lambda-CDM model), they make up around 4.9 percent of the total energy density. The remaining 95.1 percent, whose nature is still largely unclear, is composed of about 27 percent dark matter and 68 percent dark energy, as well as small contributions from neutrinos and electromagnetic radiation.