Discuss current ideas about the processes that lead to the formation of the solar system and subsequent evolution of the Earth as a planet.

Cu
ent Ideas about the Formation of the Solar System

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ent Ideas about the Formation of the Solar System
Cu
ent Ideas about the Formation of the Solar System
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ent Ideas about the Formation of the Solar System
Introduction
The Solar System contains Sun and the other planetary things gravitationally attached to it:
the 8 planets, 166 known moons of those planets, 3 little planet's (Pluto, Ceres, and Eris and
their 4 known moons), and immeasurable little bodies. This last classification contains Kuiper
elt elements, asteroids, comets, interplanetary dirt and meteoroids. In
oader terms, charted
areas of the Solar System involve the Sun, 4 te
estrial inner planets, an asteroid belt
consisting of little rough bodies, 4 gas massive external planets, and a second belt, known as
the Kuiper belt, consisting of icy things. Beyond the Kuiper belt is the spread disc, eventually
the hypothetical Oort cloud, and the heliopause (Beech, M., and Duncan, I. S., 1995). There
are a number of theories and models about the formation of the solar system. Some of the
theories are the same with other with a minor variation. We have taken few popular theories
into consideration to describe the formation of solar system and subsequently the formation
of the Earth (Beech, M., and Duncan, I. S., 1995).
Cu
ent Models of Solar System Formation
The Solar Nebula Theory
The Solar Nebula Theory is a contemporary version of Nebular Hypothesis that was initially
presented by Immanuel Kant in middle of the 18th century. The concept emphasizes that
planets along with the sun created at about the similar time from shrinking and twirling cloud
of gas and dust (Beech, M., and Duncan, I. S., 1995). The cloud was primarily hydrogen, yet
included plenty of "dust" of bulkier rudiments that "rocky" planets like Mars and Earth could
create from dust. The dust could have been perhaps partially constructed from fragments of
supernova which were blended in with primordial hydrogen (Van T. S., and Albada, N. B.,
1973).

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ent Ideas about the Formation of the Solar System
Fig.1. Solar Nebula (Source: Redo
it)
The solar nebula theory is also termed as the nebular hypothesis and is the most commonly
ecognized mode that explains the evolution and formation of the solar system. Initially, the
theory was applied to the solar system only but later on it was held true for the universe as
whole (Langner, U. W., and Potgieter, M.S., 2005). The modern modified theory which is the
most widely accepted is the Solar Nebular Disk Model or SNDM. According to the theory,
stars create dense and massive clouds of the molecular hydrogen that are termed as giant
molecular clouds (GMC) (Beech, M., and Duncan, I. S., 1995). As per SNDM, stony planets
create in the innermost section of protoplanetary disk exactly where temperatures are

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ent Ideas about the Formation of the Solar System
sufficient to avert concentration of water along with other elements into grains. This results in
the coagulation of purely rocky grains and later into the formation of rocky planetesimals.
This triggers coagulation of absolutely stony grains and afterwards into creation of stony
planetesimals. After compact planetesimals have got created, runaway accretion starts.
Development accelerates just as mass accumulates. The same results in the growth of greater
odies through the devastation of smaller sized bodies. This usually lasts between 10,000 to
100,000 years and winds after greatest bodies outdo around 1,000 km of diameter (Krasinsky,
G. A., et al., 2002).
Very next, the oligarch accretion starts. Thousands of the greatest bodies or oligarchs ca
y
on and accrete planetesimals. Merely the oligarchs develop. Sporadically, oligarchs influence
one another and create a greater body. The outcome of oligarchic phase is creation of
approximately 100 components between dimensions of the Mars and Moon. Very last is
merger stage (Langner, U. W., and Potgieter, M.S., 2005). This starts when oligarchs turn
into massive to pertu
one another leading to their o
its to develop into chaotic. This holds
up for 10 to 100 million years and makes up quite a limited number of bodies of the size of
Earth. A few of oligarchs are said to have ca
ied water on Earth. The resultant rocky planets
ultimately settle into around stable o
its (Van T. S., and Albada, N. B., 1973).
The Composition of Jupiter
The issue of proportion of the composition of Jupiter, lately observed, tends to be worth...