The earth in the solar system

The earth in the solar system

The earth in the solar system

Celestial Bodies :- The sun, the moon, and all those objects shining in the night sky are called celestial bodies.

Star :- Stars have their own heat and light.

Constellation :- Patterns Formed by different groups of stars.

Example :- Saptarishi(Group of 7 stars). Ursa major and Big bear is a constellation.

Planets :- Taken from the Greek word Plantei it means wanderers.

Solar system :- Sun + 8 Planets + Satellites + Asteroids +  Meteoroids

Note:-

 Geo + Logy → Study of the earth

Geo + metry → measurement of the earth

Geo + Oid → resembling the shape of the earth

Sun:- It is a star. 150 million km away from the earth.

Planets :-

  1. Mercury :- Nearest to the Sun
  2. Venus :- Earth’s Twin, Hottest Planet
  3. Earth :- Third nearest to the Sun, Fifth Largest,Blue planet
  4. Mars :- Red planet
  5. Jupiter :- Largest Planet
  6. Saturn :- 2nd Largest
  7. Uranus :- Coldest
  8. Neptune:- Farthest from the Sun

Jovian Planet :- Jupiter, Saturn Uranus,Neptune these 4 planets known as Jovian Planet.

Astronomy :- study of celestial body

Earth :-

  • Shape:- Geoid
  • Distance between earth and moon:- 3,84,400km
  • The moon is the closest celestial body of the earth.

Moon:-

  • The moon moves around the earth in 27 days and also spins in 27 days.
  • Only one side of the moon is visible to us.
  • Neil Armstrong:- first man to step on the surface of the moon on 20 July 1969.

Satellite :- A satellite is a celestial body that moves around the planets in the same way as the planets move around the sun.

Asteroids :- Tiny body which moves around the sun.

Meteoroids :- Small pieces of rocks that move around the Sun.

Milky Way :- Cluster of millions of stars.

Galaxy :- system of billion of stars, Clouds of gases and dust

Universe :- Million of Galaxies

Note :- Speed of light:- 3×10^8 m/s

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