COMPOSITION OF THE SOLAR SYSTEM

COMPOSITION OF THE SOLAR SYSTEM

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COMPOSITION OF THE SOLAR SYSTEM

  1. The Sun

It’s the centre of the universe.

Characteristics

  • It’s a star.

A star is a heavenly possessing its own light which it transmits. Nebula/galaxy is a cluster of stars.

The earth is in a galaxy called The Milky Way.

  • It’s made of very hot gases mainly hydrogen (70%) and helium (30%).
  • Has a diameter of 1392000km.
  • Surrounded by a layer of gas which has boiled from its surface which is called corona.
  • Rotates on its own axis in anticlockwise direction.
  • Has gravitational pull which holds all the planets in orbit around it.

An orbit is a path which a planet or a satellite follows around a star or a planet.

  • Temperature at its centre is 15m◦c and at the surface is 5500◦c.
  • Radiates solar energy which is very important for all forms of life on the earth.
  1. The Planets

 

Planets are large spherical celestial/heavenly bodies in space.

There are 9 planets in our solar system.

Characteristics

  • Spherical in shape
  • Don’t have their own light but reflect it from the sun.
  • Revolve around the sun in anticlockwise direction.
  • Have their own force of gravity
  • Only one is known to support life.

The following are the planets arranged in order from the one nearest to 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

 

Earth

  • The 3rd planet from the sun
  • The earth and the heavenly bodies make the universe
  • The only planet that supports life
  • The home of man
  • Approximately 149m km from the sun
  • Takes 365 ¼ days to revolve around the sun
  • Has one satellite, the moon

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

Pluto

  • 9th planet from the earth
  • Farthest from the sun
  • The smallest
  • 1/6 the size of the earth
  • Approximately 5900m km from the sun
  • Takes 248 earth years to revolve around the sun
  • Has one satellite
  • Very little is known about it Other Celestial Bodies

 

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