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EARTH SCIENCEEARTH SCIENCE

QUARTER 1

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QU

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LESSON

11

UNIVERSE AND

SOLAR SYSTEM

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THEORIES OF ORIGIN AND EVOLUTION

THE SOLAR SYSTEM

1. Nebular Hypothesis

2. Tidal Hypothesis

3. Planetesimal Hypothesis

4. Binary Star Hypothesis

5. Gas Dust loud Hypothesis

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The Nebular Hypohe!"!

Proposed by the German philosophers Kant and

French mathematician Laplace.

The central idea of this hypothesis of the origin ofthe solar system is that the Earth, planets and sun

originated from Nebula, or a spinning cloud of dust

which collapsed on its own graity which caused it so

spin faster. ! gaseous ring was separated from thenebula which later on became the planets that we hae

today while a dense clump of matter was formed at the

center called a proto"star which became the #un.

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A

C

D

E

#

The Nebular Hypohe!"!

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T"$al Hypohe!"!

A

C

D

E

#

Proposed by $eans and $effrey in %&'(

The central idea of this hypothesis is

that large stars passed near the sun and

due to the graitational pull a gaseoustide was raised on the surface of the sun

and the star. !s the star came nearer, the

tide increased in si)e and this gaseous

tide was detached when the star moed

away and this gaseous tide later formedto be planets in our solar system.

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%la&ee!"'al Hypohe!"!

Proposed by *hamberlin and +oulton in %&-

This hypothesis centers on the idea that a dis shaped cloud ofgas and dust which was a remnant after the formation of the sun

began to clump together forming bodies of planetesimals. /hen

this planetesimals reached a si)e of about % m they began

attracting other floating bodies due their graity. Eentuallythese planetesimals got larger enough to form planets.

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%la&ee!"'al Hypohe!"!

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#"&ary Sar Hypohe!"!

Proposed by !merican astronomer 0.N 1usell in %&23 to sole

the 4uestion raised on the tidal hypothesis.

This hypothesis centers on the idea that a dis shaped cloud of

gas and dust which was a remnant after the formation of the sun

began to clump together forming bodies of planetesimals. /hen

this planetesimals reached a si)e of about % m they beganattracting other floating bodies due their graity. Eentually

these planetesimals got larger enough to form planets.