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THE ORIGIN OF THE SOLAR SYSTEM
A model is a representation of an idea, an object, or even a process that is used to describe and
explain phenomena that cannot be experienced directly
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Therefore, a model is a scientist's description of an event at that time, demonstrating
how science knowledge is tentative
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Claudius Ptolemy's geocentric model, which states that Earth is at center of the Solar
System, and;
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°° During the time of Claudius Ptolemy, the geocentric model was the accepted explanation of
the different motions in the universe
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Their idea of a Solar System at that time was
their idea of the universe where planets move with respect to fixed stars, with changing
brightness, changing speed, and having retrograde motion (strange motion caused by earth's
motion)
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This proposal became the foundation of
the Copernican revolution
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The following scientific theories present
the explanation on the origin of the Solar System
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°° Angular momentum is the quantity of rotation of a body, which is the product of its
moment of inertia and its angular velocity
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Nebular Hypothes - Immanuel Kant (1724-1804) and Pierre-Simon Laplace (1749-1827)
were the first to propose the earliest theory of how the Solar System originated
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The mutual gravitational attraction between particles
caused them to start moving and colliding, and they were kept together by electrostatic forces
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✓ The Orion Nebula
The Orion nebula situated at the constellation Orion is one of the brightest nel naked eye, and the
closest region of a massive star formation on Earth
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✓ Some 40 years later, Pierre-Simon Laplace worked on the existing Kant model, explaining
that with the sun already formed, the continuous rotation of the Solar System around an axis
would create the planets
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As the contraction continues, the sun's rotational velocity would increase, following
the law of conservation of angular momentum
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The action of the two forces would
create a ring of material within the plane of the sun's equator
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✓ They proposed that a star passed close enough to the sun, creating huge tides and causing
materials to be ejected
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Accretion of planetisimals created the larger bodies or protoplanets
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The Jeans Jeffreys's tidal theory suggested that when a huge tidal
wave was created from sun's collision with another star, along filament was drawn out and
detached from the principal mass
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✓ The dense area of the nebula and the gaseous matter surrounding it ceased to rotate uniformly
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✓ The chemical and physical differences of the planetary formation was provided by Harold
Urey
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Because of their proximity to the sun, the gas giants Jupiter, Saturn, Uranus, and
Neptune) were prevented from forming earthly materials and were only made up of methane,
water, and ammonia

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