7 Theories of Origin of Earth – Part – 2 YouTube Lecture Handouts

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Origin of Earth

  • 4.6 billion years ago

  • Sun and planets coalesced out of a vast cloud of gas and dust.

  • Earth was hot glowing ball of white hot gases.

  • Particles of gases were compressed together, giving off heat.

  • Gases cooled down.

  • Heavy material went to center of earth.

  • Liquid material went to center.

Otto Schmidt’S Inter-Stellar Dust Cloud Hypothesis

  • Otto Schmidt: A Russian scientist.

  • He proposed his ‘Inter- stellar –dust’ hypothesis in 1943.

  • To explain the complex problem of the origin of the earth and the solar system.

Image of Otto Schmidt's Inter-Stellar Dust Cloud Hypothesis

Image of Otto Schmidt's Inter-Stellar Dust Cloud Hypothesis

Image of Otto Schmidt's Inter-Stellar Dust Cloud Hypothesis

Nova Hypothesis - Hoyle & Lyttleton

  • Nova Hypothesis: The sun had another companion star which was much bigger than the sun, and the two together constituted a binary system.

  • Hoyle and Lyttleton: The planets of the solar system have an originated from the expanding gases obtained from the explosion of a supernova.

Binary Star Hypothesis – Russell

  • Propounded in 1937.

  • To remove the shortcomings of tidal hypothesis of sir James Jeans.

Image of Binary Star Hypothesis - Russell

Image of Binary Star Hypothesis - Russell

Image of Binary Star Hypothesis - Russell

Big Bang Theory

Image of Big Bang Model

Image of Big Bang Model

Image of Big Bang Model

STEADY STATE THEORY

It is an alternative to the Big Bang model of the evolution of the universe.

Image of Steady State Model

Image of Steady State Model

Image of Steady State Model

Electromagnetic Theory - Hannas Alfven

  • Hannas Alfven was a Swedish scientist.

  • Considered one of the founding father of the field of space plasma physics.

  • He Known for:

    • Magnetohydrodynamics

    • Plasma cosmology

    • Alfvén wave

Dust Gas Cloud Theory – Weizsacker

This hypothesis explains well some of the observed phenomena relating to solar system.