(b) What is meant by the ‘Solar System’?

Answer:- The solar system is made up of the Sun, the eight planets, satellites, and some other asteroids and meteoroids.

 (c) Name all the planets according to their distance from the sun.

Answer:- Name of all the planets according to their distance from the sun are – Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.

 (d) Why is the Earth called a unique planet?

Answer:- The Earth is a unique planet in the solar system because life supporting favourable Conditions are only found on the Earth, and its neither too hot nor too cold. It has water and air, which are essential for our survival.

 (e) Why do we see only one side of the moon always?

Answer:- The moon moves around the earth in about 27 days. It takes exactly the same time to complete one spin. As a result, only one side of the moon is visible to us on the earth.

 (f) What is the Universe ?

Answer:- Millions of galaxies together form the universe. A galaxy is a huge system of billions of stars and clouds of dust and gases.

Question 2. Tick the correct answer.

(a) The planet known as the “Earth’s Twin” is

(i) Jupiter (ii) Saturn (iii) Venus

Answer:- (iii) Venus

 (b) Which is the third nearest planet to the sun ?

(i) Venus (ii) Earth (iii) Mercury

Answer:- (ii) Earth

 (c) All the planets move around the sun in a

(i) Circular path (ii) Rectangular path (iii) Elongated path

Answer:- (iii) Elongated path

(d) The Pole Star indicates the direction to the

(i) South (ii) North (iii) East

Answer:- (ii) North

(e) Asteroids are found between the orbits of

(i) Saturn and Jupiter (ii) Mars and Jupiter (iii) The Earth and Mars

Answer:- (ii) Mars and Jupiter

Question 3. Fill in the blanks.

(a) A group of ________ forming various patterns is called a ________.

(b) A huge system of stars is called________.

(c) ________is the closest celestial body to our earth.

(d) ________is the third nearest planet to the sun.

(e) Planets do not have their own________ and ___________________.

Answer:-

(a) stars, constellation

(b) galaxy

(c) The moon

(d) The earth

(e) heat, light.