Class 6 Social Science Chapter 1 The Earth In The Solar System

Chapter 1 NCERT Class 6 Geography deals with the earth, planets, stars and the sun.

1. What are orbits?

The elongated paths in which planets move around the sun are called orbits.

2. Planet nearest to the sun

Mercury

3. Earth’s twin

Venus

4. The only satellite of earth

Moon

5. What is a satellite?

A satellite is a celestial body that moves around a planet.

6. How many days does the moon take to move around the earth?

27 days

7. What are asteroids?

Asteroids are the tiny bodies found between the orbits of Mars and Jupiter.

8. What are meteoroids?

The small pieces of rocks which move around the sun are called meteoroids.

9. What is a galaxy?

A galaxy is a huge system of billions of stars, and clouds of dust and gases.

10. The imaginary line which divides the globe into two equal parts

Equator

11. A miniature form of earth

Globe

12. What are celestial bodies?

The sun, the moon and all those objects shining in the night sky are called celestial bodies.

13. What are stars?

Stars are the big and hot celestial bodies made up of gases. Stars have their own heat and light.

14. How does a planet differ from a star?

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15. What is meant by the solar system?

The celestial bodies consisting of the sun, the planets, satellites, asteroids, meteoroids and also the dust particles together form the solar system.

16. Why is the earth called a unique planet?

Earth is called a unique planet because it is the only planet that supports life in our solar system. It has suitable temperature and water for sustaining life. Oxygen is found on earth and the ozone layer in the atmosphere of the earth protects all organisms from the harmful ultraviolet rays of the sun.

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17. Why do we see only one side of the moon always?

The moon takes 27 days to move around the sun. It takes exactly the same amount of time to complete one spin. As a result, only one side of the moon is visible to us from the earth.

18. What is universe?

The universe is all that exists. We all belong to it. It consists of billions of galaxies. We do not know how big the universe is, but we know one thing – anything that exists here belongs to this universe.

19. What is the difference between natural satellites and artificial satellites?

Natural satellites are the celestial bodies that move around the planets. Example: moon
Artificial satellites are the artificial bodies designed by the scientists to collect information about the universe or for communication purposes. Example: INSAT and EDUSAT.

20. What are stars made up of?

Gases

21. What are constellations?

Constellations are groups of stars that make various patterns in the sky. Examples are: Ursa Major

21. Which of the following planets have rings around them?

Jupiter, Saturn and Uranus

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