Solar system is the group of heavenly bodies comprising the sun and the planets.
The origin of the solar system
The Passing Star Theory
A star with a greater gravitational pull passed near the sun
It attracted large quantities of gaseous materials from the sun
The materials split, cooled and condensed to form planets
The planets were set in orbit by the passing star
The Nebula Cloud Theory
There was a slowly rotating cloud of dust and gas called Nebula. This caused high concentration of materials at the centre that formed the sun.
Rotation speed increased and successive rings of gaseous materials were formed.
The rings condensed to form planets.
The materials grew in size enough to exert their own gravitational pull.
The central gaseous material remained as the sun
Mercury
Nearest from the sun
Its 58m km from the sun
Has no satellites
Takes approximately 88 earth days to revolve around the sun
Venus
2nd planet from the sun
It’s 108m km from the sun
One of the brightest planets
Can be seen clearly with naked eyes
Takes approximately 225 earth days to revolve around the sun
Slightly smaller than the earth
Has no satellites
Together with the earth they are called twin planets due to having many similarities
Mars
Also called The Red Planet because when it’s observed through a telescope it appears reddish.
The 4th from the sun
Slightly smaller than the earth
Approximately 228m km from the sun
Takes 687 earth days to revolve around the sun
Between Mass and Jupiter there are small celestial bodies called planetoids.
Has no satellite.
Jupiter
5th planet from the sun
Approximately 778m km from the sun
Largest in the universe
Rotates on its own axis at very fast speed
Has flattened poles due to its fast speed of rotation
Has very thick layers of ice on its surface
Takes 12 earth years to revolve around the sun
Has 16 satellites
Saturn
6th planet from the sun
Second largest planet
Approximately 1427m km from the sun
Takes 29 ½ earth years to revolve around the sun
Has a ring around it
Has 18 satellites
Uranus
7th planet from the sun
About 4 times bigger than the earth
Approximately 2870m km from the sun
Also rotates very fast
Also has flattened poles due to fast speed of rotation
It appears greenish foe being surrounded by methane gas
Has 8 satellites
Takes 84 earth years to revolve around the sun
Neptune
One of the farthest from the sun
8th planet from the sun
Approximately 4497m km from the sun
Has 8 satellites
Takes 165 earth years to revolve around the sun
Very similar in size, colour and character with Uranus.
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