Size of earth compared to the observable universe
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Earth Size and Radius Compared to Observable Universe
The Earth has a radius of about 6.4 × 10^6 meters (6,400 kilometers) and a mass of approximately 6 × 10^27 grams Cui2023Nagy2020. These values are well established and confirmed by various methods, including relativistic matter wave calculations and astronomical measurements .
Observable Universe Size and Scale
The observable universe is vastly larger than the Earth. Its radius is estimated to be about 46 billion light-years, which is roughly 4.4 × 10^26 meters. The age of the universe is about 13.7 billion years, and this immense size is a result of the expansion of space over cosmic time Nagy2022Pepe2013. Calculations using the Hubble constant and general relativity confirm these enormous distances and time scales Nagy2022Pepe2013.
Direct Size Comparison: Earth vs. Observable Universe
When comparing the size of the Earth to the observable universe, the difference is extreme. The Earth's radius (6.4 × 10^6 meters) is minuscule compared to the universe's radius (4.4 × 10^26 meters). This means the observable universe is about 10^20 times larger in radius than the Earth Cui2023Nagy2020Nagy2022+1 MORE. In terms of volume, the difference is even more dramatic, as volume scales with the cube of the radius.
Conclusion
The Earth is incredibly small compared to the observable universe. While the Earth’s radius is about 6,400 kilometers, the observable universe stretches across billions of light-years, making the Earth’s size negligible on a cosmic scale Cui2023Nagy2020Nagy2022+1 MORE. This vast difference highlights the immense scale of the universe relative to our planet.
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Most relevant research papers on this topic
A super-Earth transiting a nearby low-mass star
GJ 1214b, a super-Earth with a mass of 6.55M_ and a radius 2.68 times Earth's radius, has a primarily water composition and is transiting a nearby low-mass star, making its atmosphere accessible for study with current observatories.
Size Evolution of Close-in Super-Earths through Giant Impacts and Photoevaporation
Super-Earths can evolve their sizes through both giant impacts and photoevaporation, potentially reproducing observed features and revealing similar sizes and regular spacings between adjacent planets.
Not the Earth, but its orbit: Andre Tacquet and the question of star sizes in a heliocentric universe
In a heliocentric universe, star sizes compare to Earth's orbit via the same proportion as they do in a geocentric universe, with no detectable parallax in the stars.
QUAL É O TAMANHO DO UNIVERSO? UMA PROPOSTA DE SEQUÊNCIA DE ENSINO INVESTIGATIVO SOBRE OS MÉTODOS DE ERATÓSTENES E ARISTARCO PARA MEDIR OS TAMANHOS DA TERRA E DA LUA
This paper proposes an inquiry teaching sequence for Basic Education that explores historical and interdisciplinary aspects in determining the sizes of the Earth and Moon, using common natural phenomena and geometric and physical principles.
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