Most of the baryonic matter (ordinary matter) in the universe is found in stars and galaxies. These include:
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Stars: A significant portion of baryonic matter is concentrated in stars, which are primarily composed of hydrogen and helium. Stars produce energy through nuclear fusion and are the dominant sources of light in the universe.
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Galaxies: Galaxies contain not only stars but also gas and dust. The interstellar medium, which includes hydrogen gas, is a crucial component of galaxies, contributing to the overall baryonic matter content.
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Galaxy Clusters: Within galaxy clusters, there is also a substantial amount of hot, ionized gas known as the intracluster medium, which contributes further to the baryonic matter present in the universe.
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Planetary Systems: While a smaller fraction compared to stars and galaxies, baryonic matter is also found in planets, moons, asteroids, and comets within various solar systems.
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Intergalactic Medium: There is some baryonic matter in the form of diffuse hydrogen gas in the intergalactic medium, although this is less concentrated than in galaxies and stars.
Overall, while baryonic matter exists in various forms throughout the universe, most of it is found in the structures of stars and galaxies.
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