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Planck Length


The Planck length is the smallest meaningful unit of length in physics, representing a fundamental scale at which classical ideas about gravity and space-time break down and quantum effects dominate.



  • It is defined as approximately 1.616 × 10⁻³⁵ meters.



  • The Planck length is derived from fundamental constants: the speed of light, Planck’s constant, and the gravitational constant.



  • It sets a theoretical limit below which the very concepts of space and distance may lose conventional meaning.



  • Used mainly in theories of quantum gravity and string theory.



Key facts:



  • 1 Planck length ≈ 1.616 × 10⁻³⁵ m



  • Smallest scale in quantum physics and cosmology



  • Represents a scale where quantum effects of gravity become significant



The Planck length is crucial for understanding the fabric of the universe at its most fundamental level.



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.



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