UPSC Geography 05- Theories of Planets Formation

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UPSC Geography 05- Theories of Planets Formation

Gaseous Hypothesis

• Theory considers that the earth originated as a hot mass and cooled slowly to develop a solid mass like body
• Given by kant (18th Century)

Nebular Hypothesis

• Given by Simon Laplace 1749
• Planets formed from rings

Tidal Hypothesis

• Given by Jeans and Jeffreys 1919
• tidal interaction between the Sun and a passing star would raise tides on the Sun resulting in the loss of a single cigar-shaped filament of hot gas. This hot gas would then condense directly into the planets instead of going through a planetesimal stage. The central section of the "cigar" would give rise to the largest planets – Jupiter and Saturn – while the tapering ends would provide the substance for the smaller worlds. 
• Aks Encounter Hypothesis

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