The document discusses theories about the formation of the solar system. It describes the universal law of gravitation proposed by Isaac Newton which explains how gravity keeps the planets in orbit around the sun. It also discusses the planetisimal theory proposed in 1778, which states that the solar system formed from materials thrown off after a collision between the sun and another star. Additionally, it summarizes the companion star theory that the sun once had a companion star that exploded, and the nebular hypothesis from 1776 proposing that the solar system originated from a vast swirling nebula that condensed to form the sun and planets.

2. The Solar System

3. THE SOLAR SYSTEM

4. Universal Law of Gravitation
Sir Isaac Newton explains what keeps the celestial objects,
particularly the planets, in orbit around the sun.
Gravitational Pull or the force of attraction exerted by the
pulling them towards it, is one of the forces that hold
the planets in orbit.

5. Force of Inertia or the
force exerted that keeps
the planets moving and
spinning.
Gravity and Inertia work
together resulting to a
stable planetary orbit.

7. Planetisimal Theory
Proposed by Georges Comte de Buffon (French
Scientist) in 1778.
This theory states that the solar system was formed
when the sun collided with another star.
Causing the large masses of materials from the two
stars to be thrown off into space
Then, the said materials cooled and condensed then
formed small bodies, which we now call, planets.

8. Planetisimal Theory Georges Comte de Buffon

9. Companion Star Theory
According to a British Astronomer, Fred Hoyle that
the sun once had a companion star.
The said companion star exploded when it
collided with the sun.
Then, the materials from the explosion were held
by the sun’s gravitation.
From these materials, various planets and other
objects in the solar system were formed.

10. Companion Star Theory Fred Hoyle

11. Proposed by Marquis De Laplace, a French Astronomer in
1976
According to him, a vast, saucer-shaped nebula (similar to
a protostar) was swirling slowly in space.
And, suddenly, it cooled and shrank
Causing it to spin faster in space.
Due to the speed of its spin, the rings of materials broke
away from its outer edge.
Those rings gave rise to planets, and when the center of the
nebula condensed, it then became the Sun.
Nebular Hypothesis

12. Nebular Hypothesis Marquis de Laplace

13. Source:
 https://goo.gl/h2MPq5
 https://goo.gl/dwdI4u
 http://goo.gl/IBbk5u
 https://goo.gl/nbB0jF
 http://goo.gl/9jwhHd
 Science Links 8 (2015)
 https://goo.gl/dwLTkJ
 https://goo.gl/k4ogrd
 https://goo.gl/PI6Fu8
 https://goo.gl/6unxI9
 https://goo.gl/F0gezL

14. Thank you and GOD
Bless!!!