Aspiring civil servants preparing for the UPSC examination often delve into various subjects, including the scientific theories that explain the origin of Earth. Scholars and scientists have proposed numerous hypotheses, each offering a unique perspective on how our planet came into existence. Despite the divergent opinions on Earth's age, ranging from 3 to 5 billion years, there's a consensus among experts regarding the geological history of our home.
Theories Explored
1. Buffon’s Hypothesis by Georges de Buffon:
This hypothesis suggests that Earth formed from huge comets that came close to the sun, eventually leading to the creation of planets and sub-planets.
2. Gaseous Hypothesis by Kant:
Kant's theory proposes that Earth originated from the solidification of a slowly rotating cloud of gas, setting the stage for planetary formation.
3. Nebular Hypothesis by Laplace and Wizeker:
According to Laplace and Wizeker, Earth formed from the solidification of a ring ejected by a cooling and rotating nebula, shaping our planet as we know it today.
4. Tidal (Collision) Hypothesis by Jeans and Jaffreys:
This hypothesis explores the concept of Earth evolving from the existence of two nebulas rather than a single one, contributing to the diversity of celestial bodies.
5. Planetesimal Hypothesis by Chamberlin & Moulton:
Chamberlin & Moulton's theory suggests that Earth originated from the collision or interaction between two celestial bodies in the universe.
6. Big-Bang (Modern) Hypothesis by Abbe Georges Lemaitre:
This widely accepted theory not only explains Earth's origin but also delves into the rapid expansion of the universe, shedding light on the vast cosmos.
7. Binary Star Hypothesis by H.N. Russell:
H.N. Russell's hypothesis posits that our sun once existed as part of a binary star system, hinting at a complex cosmic history.
8. Supernova Hypothesis by F. Hoyle:
F. Hoyle's theory suggests that the universe initially had two stars, with one evolving into a supernova due to nuclear reactions, shaping the cosmic landscape.
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