Total mass of the universe
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Estimates of the Total Mass of the Universe
Mass of the Universe: Key Figures and Methods
Multiple studies have estimated the total mass of the universe using different theoretical frameworks and observational data. A common value cited in several works is a mass on the order of 10^55 grams, which is equivalent to about 10^79 protons or roughly 2 × 10^49 tons. This estimate is supported by both classical and quantum cosmological models, and is consistent with the number of stars and fundamental particles believed to exist in the universe 25.
Recent quantum-based approaches also yield similar results. For example, one quantum theory estimates the total mass of the universe to be about 4 × 10^78 GeV/c^2, which is approximately 4 × 10^21 solar masses . Another modern analysis, using gravitational radius concepts, suggests a mass of about 6 × 10^22 solar masses for the observable universe .
Contributions from Radiation and Dark Energy
The mass of the universe is not solely from stars and matter; radiation also contributes, but its share is very small—less than 1% of the total mass. Even with the continuous emission of radiation, it would take much longer than the current age of the universe for radiation to accumulate to a significant fraction of the total mass .
Some calculations explicitly exclude dark energy from the mass estimate, focusing only on matter and kinetic energy. These studies find that the total mechanical energy of the universe is close to zero, suggesting a balance between gravitational and kinetic energies due to cosmic expansion .
Theoretical Perspectives: Quantum Gravity and Reference Frames
There are also theoretical models that propose the universe has its own intrinsic mass, analogous to the mass of a particle in quantum mechanics. This "own mass" is thought to arise from the initial conditions of the universe and affects the geometry of space itself, independent of ordinary matter .
Consistency Across Models
Despite differences in methodology—ranging from classical mechanics and Newtonian gravity to quantum theory and cosmological observations—most estimates for the total mass of the universe converge on similar magnitudes. These values are typically in the range of 10^21 to 10^22 solar masses, or about 10^55 grams 1245+1 MORE.
Conclusion
The total mass of the universe is estimated to be around 10^21 to 10^22 solar masses, or about 10^55 grams, based on a variety of classical, quantum, and observational approaches. While radiation and dark energy play roles in the universe's energy balance, the dominant contribution to mass comes from matter—both visible and dark. These consistent estimates across different models provide a robust understanding of the universe's total mass.
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