NCERT Class 6 Geography Chapter 1: Earth in Solar System YouTube Lecture Handout

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Watch Video Lecture on YouTube: NCERT Class 6 Geography Chapter 1: Earth in the Solar System

NCERT Class 6 Geography Chapter 1: Earth in the Solar System

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Galaxy

  • Gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter

  • Example, Milky Way (contains Solar System)

  • March 2016, Most distant galaxy – GN-z11

  • Hubble’s Classification

    • Elliptical (E)

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

    • Lenticular

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

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

Image of Celestial Bodies

  • Celestial Bodies

  • Emit their own heat and Light – Star (Example, SUN)

  • Don’t emit their own light – Planets

  • Planets – Greek Word – Planetai i.e. Wanderer

  • NORTH STAR – POLE STAR – Indicates north Direction

Constellations (Group of Stars) – 88 Officially

Constellations (Group of Stars) Image-1

Constellations (Group of Stars) Image-1

Constellations (Group of Stars) Image-2

Constellations (Group of Stars) Image-2

Planets

Image shows Planets

Image Shows Planets

Dwarf Planets

  • Ceres - largest object in asteroid between Mars and Jupiter

  • Pluto – Small Size, Offbeat Orbit, Beyond Kuiper Belt, Now Planetoid

  • Eris - 2003 UB313 – 10th planet & largest dwarf discovered

  • Oort Cloud are composed of ices like ammonia, methane & water

  • Kuiper Belt – Ice belt beyond Neptune

  • Planet Nine in Kuiper Belt is 10 times the mass of Earth and 5,000 times the mass of Pluto.

  • Kuiper similar to asteroid belt between Mars and Jupiter

Earth

Image shows Earth

Image Shows Earth

  • Shape – Geoid or Oblate Spheroid

  • 3rd nearest to sun

  • 5th largest planet

  • Age: 4.54 billion years old

  • Chemical composition of Crust – Silica, alumina, lime

  • Earth’s mass - Iron (32%), Oxygen (30%), Silicon (15%)

  • Earth’s Crust – 47% Oxygen

  • Rotation & Revolution

  • Earth's perihelion (closest) around 3 January & aphelion around 4 July.

Moon

  • Natural Satellite – Celestial body that moves around planet

  • Moon’s Diameter – 1/4th of earth (5th largest natural satellite)

  • Tides: Gravitational attraction between moon and earth

  • Ganymede – Largest moon in Solar System (Jupiter)

  • Titan – 2nd largest moon in solar system (Saturn)

  • Distance from earth: 384,400 km

  • Sidereal Month: w.r.t. to distant stars, 1 revolution relative to stars – 27.32 days

  • Synodic Month: w.r.t. to Sun, time taken by moon to reach the same visual phase - 29.53 days. Longer period is required to achieve similar alignment of Earth, the Sun, and the Moon.

  • Chandrayaan-I and II, TeamIndus (Unmanned spacecraft to moon)

  • Asteroids

  • Meteoroids

  • Comets

  • Pulsars

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