Planetesimal Hypothesis of Origin of the Earth

-

Planetesimal Hypothesis

This hypothesis was given by Chamberlin and Moulton in 1904. This biparental (binary) hypothesis of origin and also is the catastrophic hypothesis because the earth including all planets came into space due to disruptive forces between the sun and the strong gravitational pull of passing star.

According to this hypothesis a large star passed near the sun which distorted of the sun due to large gravitational pull of the star. Thus due distortion in the surface of pre existing sun a number of gaseous masses ejected out to great distance in space. Then these gaseous masses broke into a large number of small chunks were subjected to colling resulted into the formation of solid bodies which are called PLANETESIMALS.

Since these are in the area of gravitational field of the sun started rotation around the sun in the elliptical paths randomly. These planetesimals during the rotation collided with each other which resulted into breaking as well as fused together which gradually gave rise to the planets.  
On cooling, contraction and consolidation the earth and other planets originated from the pre existing sun and revolving around the sun in elliptical orbits and also rotating on their own axes.

There are 8 planets-
1. Mercury
2. Venus
3. Earth
4. Mars
5. Jupiter
6. Saturn
7. Uranus
8. Neptune.
 

Comments

  1. UnknownJanuary 14, 2022 at 6:32 PM

    rotating around the sun in elliptical orbits and also revolving on their own axes.


    Sir isme क्या likha h...

    ReplyDelete
  2. GeologyJanuary 14, 2022 at 8:04 PM

    Yes thanks corrected.

    ReplyDelete

Post a Comment

Popular posts from this blog

Minerals : Classification and Physical properties

-
Image
Mineral is a naturally occurring, homogeneous inorganic compound having fixed chemical composition and atomic structure formed due to inorganic processes of the Earth. Classification of Rock forming Minerals These are mainly of two types I Silicates Silicates again subdivided into 1. Ferromagnesian minerals i)  Olivine group of minerals ii) Pyroxene group of minerals iii) Amphibole group of minerals iv) Biotite 2. Non Ferromagnesian minerals i)  Feldspar group of minerals ii) Quartz group of minerals iii) Muscovite II Non Silicates Oxides Sulphides Sulphates Carbonates Physical Properties of Minerals Minerals are identified on the basis of following physical properties 1. Colour 2. Streak 3. Lustre 4. Fracture 5. Cleavage 6. Hardness 7. Specific Gravity 8. Form and structure  1. Colour The colour of a mineral depends on the absorption of some and reflectance of other of the coloured rays which constitute the white light. 2. Streak Streak of a miner...
Read more

Dam and its distribution

-
Image
What is a Dam? A dam is a barrier constructed across a river or stream to regulate, manage, or block the flow of water. It creates a reservoir, lake, or impoundment behind it, which can be used for various purposes. Dams are critical components of water resource management systems and contribute significantly to agriculture, industry, and urban development. --- Types of Dams 1. Gravity Dams: Built with concrete or stone, relying on their weight to hold back water (e.g., Bhakra Nangal Dam). 2. Embankment Dams: Made with earth or rockfill; these are cheaper and suitable for wide river valleys (e.g., Hirakud Dam). 3. Arch Dams: Curved dams designed to distribute water pressure (e.g., Idukki Dam). 4. Buttress Dams: Use supports or buttresses to hold back water. 5. Detention Dams: Designed to store water temporarily to control floods. --- Purposes of a Dam Dams serve various purposes that directly benefit humans and the environment. Below are detailed explanations of these purposes: 1. Irri...
Read more

Forms of Igneous Rocks (Igneous Bodies)

-
Image
Concordant and Discordant Forms of Igneous Rocks  Igneous intrusions are classified based on their relationship to the pre-existing rock layers (country rocks). These intrusions can either conform to or disrupt the layering of the surrounding rocks, giving rise to concordant and discordant forms. --- Concordant Forms Concordant intrusions occur when magma is injected along bedding planes or between layers of pre-existing rocks, aligning with the natural structure without significantly disturbing it. 1. Sills Definition: Thin, horizontal sheets of magma that solidify parallel to the bedding planes. Formation: Formed when magma intrudes between sedimentary or other layered rocks under low pressure. Characteristics: Typically uniform in thickness. May vary in composition (basaltic sills are common). --- 2. Laccoliths Definition: Dome-shaped intrusions where magma pushes the overlying layers upward, forming a convex structure. Formation: Result from magma of high viscosity (e.g., grani...
Read more