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Earth’s Distance from the Sun


The average distance between the Earth and the Sun is known as an Astronomical Unit (AU).



  • It is approximately 149.6 million kilometers (about 93 million miles).



  • This distance varies slightly throughout the year because Earth’s orbit is elliptical—closest at perihelion (~147.1 million km) and farthest at aphelion (~152.1 million km).



  • The astronomical unit is a fundamental standard for measuring distances within our solar system.



Key facts:



  • Average distance ≈ 149.6 million km (1 AU)



  • Varies due to elliptical orbit



  • Basis for measuring planetary distances



Understanding Earth’s distance from the Sun is essential for studying seasons, climate, and orbital mechanics.


Bohr Radius


The Bohr radius is a fundamental physical constant that represents the average distance between the nucleus and the electron in a hydrogen atom in its ground state, according to the Bohr model of the atom.



  • Its value is approximately 5.29177 × 10⁻¹¹ meters (about 0.529 angstroms).



  • Named after physicist Niels Bohr, who introduced the model in 1913.



  • It sets a natural length scale in atomic physics and quantum mechanics.



  • Used to describe atomic sizes and electron orbitals.



Key facts:



  • Bohr radius ≈ 5.29 × 10⁻¹¹ m



  • Represents the typical size of a hydrogen atom’s electron orbit



  • Fundamental to quantum physics and atomic structure



The Bohr radius is essential for understanding atomic dimensions and quantum behavior of electrons.




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