This PSEB 6th Class Social Science Notes Chapter 1 Earth – As a Member of Solar System will help you in revision during exams.
PSEB 6th Class Social Science Notes Chapter 1 Earth – As a Member of Solar System
→ Universe: The Universe is a vast and infinite space having millions of galaxies and heavenly bodies.
→ Galaxy Or Milky Way: A Galaxy is a group of millions of shining stars scattered in space. It is also known as Milky Way or Akash Ganga.
→ Star: A star is a celestial body having its own heat and light.
→ Planet: A planet is a heavenly body that revolves around the sun and receives heat and light from it.
→ Satellite: A satellite is a small spherical body that revolves around a particular planet.
→ Light Year: A light-year is a distance, which a ray of light would cover in a year’s time.
→ Solar System: The sun, planets, and other heavenly bodies combine together to form the solar system.
→ Sun-spots: The black spots on the bright face of the sun are called sun-spots.
→ Orbit: Orbit is the fixed path along which the planets revolve around the sun.
→ Comets: Comets are heavenly bodies with a head and a tail.
→ Saptarishi: A constellation of seven stars and a part of the Big Bear.
→ Asteroids: Tiny bodies found between the orbit of Mars and Jupiter.
→ Neil Armstrong: The first man to set foot on the moon.
→ Moon: Natural Satellite of the earth.
→ Celestial Bodies or Heavenly Bodies: All the objects like the sun, moon and bright objects seen during the night in the sky are called celestial bodies.
→ Constellation: A group of stars forming a particular pattern or design is called a constellation.
→ Geoid: Geoid means Earth-like shape.
→ Man-made satellites: Satellites carried by rockets and placed in the orbit of the earth
→ Meteoroids: Small pieces of rocks which revolve around the sun.
→ Full Moon: The night of Poornima when the moon shines in the form of a ball.
→ New Moon: The night of Amavasya when the moon is not seen from the earth.
→ On 23rd August, the International Astronomical Conference decided that Pluto should not be considered as a planet as it does not fulfill the essentials of a planet.
→ The distance between the earth and the sun is 150 million kms.
→ Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune are the 8 planets.
→ The earth has a circumference of 40,000 km.
→ The earth has an equatorial diameter of 12,756 km.
→ The distance between earth and moon is 3,76,275 km.
→ The sun is the nearest star to us.
→ The earth is the only planet having water and life.
→ The earth is a unique planet in the Solar System.
→ A light-year is a unit to measure the distance between the bodies of the universe.
→ Neil Armstrong and Edwin Aldrin were the first cosmonauts to land on the moon on 21st July 1969.
→ The universe is huge and it includes the sun, satellites, planets, stars, etc.
→ The power of attraction of the sun, planets are called gravity.
→ Diameter = 12,756 km & 12,712 km.
→ Circumference = 40,000 km.
→ Space: Space means sky.
→ Kalpana Chawla: Astronaut of Indian Origin.
→ Saptrishi: A constellation in Great Bear.
→ Speed of light: 3 Lakh km per second.
→ Milky way: Akash Ganga in India.
→ Apollo Project: To know more about Moon.
→ Tailed Star: A comet.
→ Gravity: Power of attraction of the Sun.