NCERT Class 6 Geography Chapter 1: Earth in Solar System Complete Notes Part 1

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Earth in Solar System

Starting with Solar System, Solar is derived from “Sol” which means in roman “Sungod”. As a result all the words from ‘solar’ means related to sun. What will study in this chapter is solar system and earth in particular. Many galaxy make universe. The galaxy in which we live is Milky way and we call it Akashganga. Solar system is part of Milky Way.

Galaxy

  • Gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter is known as galaxy

  • Example, Milky Way (contains Solar System)

  • March 2016, Most distant galaxy discovered was GN-z11

  • Hubble’s Classification: Hubble’s classification is to used identified various types of galaxy. Hubble’s classified three broad category for galaxies as:

    • Elliptical (E)

    • Spiral (S): Andromeda & Sombrero (unbarred)

    • Lenticular

  • Spiral galaxy: Spiral Galaxy is most common galaxy and Andromeda is most common example of spiral galaxy. Sombrero is (unbarred) spiral galaxy. Spiral galaxy is divided in two parts Unbarred & Barred spiral galaxy.

Celestial Bodies (Sun, Moon, Objects in Night Sky)

Celestial bodies include sun, moon and objects in night sky.

Image shows type of Celestial Bodies

Image Shows Type of Celestial Bodies

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Celestial bodies here,

Image of Celestial bodies

Image of Celestial Bodies

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  • The sun is star and star around the number of planets. Then we talk about major 8 planets.

  • Between Mars and Jupiter exists the asteroids.

  • Celestial Bodies can be classified as:

  • Those which emit their own heat and Light – Star (Example, SUN)

  • Those which don’t emit their own light – Planets

  • Planets are derived from Greek Word “Planetai” which means Wanderer

  • NORTH STAR – POLE STAR – Indicates north Direction

North Star is known as pole star and it’s indicates north direction.