The Astonishing Origins of Our Home Planet: Earth's Extraordinary Journey

How does Earth come into existence? How does the solar system was formed? When did planets start revolving around Sun and when was Sun formed. Well, today we are going to learn about the formation of Earth and also other planets in the solar system.

There are a couple of theories about the origin of Earth.

The first theory in our list is Nebular Hypothesis by Kant and Laplace in 1755.

This hypothesis suggests that the solar system formed through the condensation of a nebula that once encircled around its center. According to this theory, the outer planets formed first followed by Mars, the Earth, Venus, and Mercury. This hypothesis suggests a sequential origin from the outermost planet to the innermost. As per this hypothesis, the red planet evolved earlier than the Earth.

The next theory in our list is the Planetesimal hypothesis by Chamberlain and Moulton in 1905.

According to Chamberlain and Moulton, planets were formed as a result of mutual interaction between the Sun and another star of suitable size. If you have noticed, this is a theory of the biparental origin of the solar system. This theory postulates that due to the near approach of a larger star, tidal distortion was raised upon the surface of the sun and these in conjunction with the eruptive force prevalent in the sun(known as the solar prominence) brought about a description of the mass of the sun and a number of gaseous bulbs were short forth in space to a great distance. These gaseous solar bulbs were subjected to immediate chilling, which resulted in the formation of a number of minute solid particles known as planetesimals.

The so-called planetesimals continued to rotate around the sun in highly elliptical orbits. These orbits must have happened to intersect one another and at those points of intersection, these planetesimals must have collided and gradually giving rise to nine planets.

Last but not least in our list is the Gaseous tidal hypothesis by Jeans and Jeffrey(1925). Jeans and Jeffrey also accept the idea of biparental origin like that of the previous one but in a different way by refusing to consider the idea of the disruptive forces in the sun which we called solar prominence.

According to Jeans and Jeffrey, before the formation of nine planets an extremely large star while moving through space chanced to approach the sun, due to the progressive and nearer approach of this star, a tidal pull was raised on the surface of the sun and this increased in size as the passing star approached more nearer. When the passing star began to recede, the tidal pull on the surface of the sun was detached from the body of the sun in the shape of a spindle bulging near the center and tapering at both ends. This very large mass of the gas was immediately broken down into a number of small fragments. In all, ten such pieces were formed, nine of them giving rise to the nine planets and one was broken down into pieces forming a group of planetoids.

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