The solar system consists of stars, the Sun, and everything bound to it by gravity – the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune, dwarf planets such as Pluto, dozens of moons and millions of asteroids, comets and meteoroids. NCERT Solutions for Class 6 Social Science Geography Chapter 1
The Earth is the third planet from the Sun and the only place inhabited by living things. It is the fifth-largest planet in the solar system, and it is the only planet with liquid water on the surface. Among all the four planets closest to the Sun, the Earth is the biggest planet.
NCERT Solutions for Class 6 Social Science Geography Chapter 1 The Earth in the Solar System
Chapter 1 – The Earth in the Solar System
1. Answer the following questions briefly
(a) How does a planet differ from a star?
The difference between a planet and a star is given below:
|Some celestial bodies do not have their own heat and light. They are lit by the heat and light of the stars. These bodies are called planets.||Some celestial bodies are very big and hot. They are made up of gases and they have their own heat and light. These celestial bodies are called stars.|
|Example – Earth, Mercury, etc.||Example – Sun|
(b) What is meant by the ‘Solar System’?
The sun, the eight planets, satellites and some other celestial bodies known as meteoroids and asteroids form the solar system.
(c) Name all the planets according to their distance from the sun.
The planets arranged as per their distance from the sun are – Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
(d) Why is the Earth called a unique planet?
The earth is a unique planet of the solar system because:
- Conditions favourable to support life are probably found only on the earth.
- The earth is neither too hot nor too cold. It has water and air, which are very essential for our survival.
(e) Why do we see only one side of the moon always?
We always see only one side of the moon, because the moon moves around the earth in about 27 days and it takes the same time to complete one spin.
(f) What is the Universe?
Millions of galaxies together form the Universe. A galaxy is a huge system of billions of stars and clouds of dust and gases.
2. Tick the correct answer.
(a) The planet known as the “Earth’s Twin” is
Sol : (iii) Venus
(b) Which is the third nearest planet to the sun ?
Sol : (ii)Earth
(c) All the planets move around the sun in a
(i) Circular path
(ii) Rectangular path
(iii) Elongated path
Sol : (iii) Elongated path
(d) The Pole Star indicates the direction to the
Sol : (ii) North
(e) Asteroids are found between the orbits of
(i) Saturn and Jupiter
(ii) Mars and Jupiter
(iii) The Earth and Mars
Sol : (ii) Mars and Jupiter
3. Fill in the blanks.
(a) A group of ________ forming various patterns is called a ________.
Sol : stars,constellation
(b) A huge system of stars is called________.
Sol : galaxy
(c) ________is the closest celestial body to our earth.
Sol : Moon
(d) ________is the third nearest planet to the sun.
Sol : Earth
(e) Planets do not have their own________ and ___________________.
Sol : Heat, light
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