Mass of the universe
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Estimates of the Mass of the Universe
Across various cosmological theories and models, the estimated mass of the universe consistently falls within a similar range. Early theoretical work and calculations by Eddington and others suggest a mass of about 10^55 grams, which is equivalent to roughly 10^79 protons or about 2.55 × 10^49 tons. This estimate is supported by calculations based on the number of stars, protons, and electrons in the universe, showing close agreement between different approaches to estimating the universe's mass 124.
Modern Cosmological Models and Mass Calculations
Recent models, including those based on quantum theory and gravitational binding, estimate the universe's mass to be around 4 × 10^78 GeV/c^2, or approximately 4 × 10^21 solar masses. Another contemporary approach, which interprets cosmic acceleration as a measurement of the universe's gravitational radius, suggests a mass of about 6 × 10^22 solar masses. These values are consistent with the energy density observed in the universe and align with the standard cosmological model's predictions 35.
Mass-to-Light Ratio and Dark Matter Distribution
Observational studies using weak lensing and the distribution of starlight indicate that the mass-to-light ratio becomes nearly constant on large scales, suggesting that stars trace the overall mass distribution well, even though they make up only a small fraction of the total mass. The stellar mass fraction is found to be about 1% of the total mass, with most of the universe's mass residing in dark matter halos around galaxies and clusters. These observations yield a mass density parameter (Ω_m) of about 0.26, which is consistent with other independent measurements .
Theoretical Perspectives and Quantum Gravity
Some theoretical models propose that the mass of the universe is directly related to fundamental constants, such as the Planck mass and Planck length. In these models, the ratio of the universe's mass to its radius mirrors the ratio of the Planck mass to the Planck length, suggesting a deep connection between cosmological and quantum scales . Other quantum gravity approaches introduce the idea of the universe having its own intrinsic mass, which influences the geometry of space and the reference frames used in cosmological models .
Contribution of Radiation and Other Components
The mass of radiation, while present, is considered to be a very small fraction of the total mass of the universe—less than 1%. This is consistent with the observed age of the stars and the rate at which radiation accumulates over cosmic time .
Conclusion
Despite differences in theoretical frameworks and observational techniques, estimates of the mass of the universe converge on values around 10^55 grams or several times 10^21–10^22 solar masses. Most of this mass is in the form of dark matter, with stars and radiation contributing only a small fraction. The consistency of these estimates across classical, quantum, and observational approaches highlights a robust understanding of the universe's total mass and its distribution on cosmic scales 1234+3 MORE.
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