What percentage of the total mass-energy density does normal matter account for?
Answer
5%
Normal matter, scientifically known as baryonic matter, which encompasses all observable components like protons, neutrons, electrons, stars, planets, and gas clouds, constitutes only about five percent of the entire universe's mass-energy density. This realization highlights that everything directly observed or measured by astronomers, despite its apparent ubiquity in local experience, represents a very small fraction of the cosmos's total content. The vast majority of the universe is composed of components that cannot be seen directly, rendering the tangible reality merely a small component of the overall cosmic inventory.
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