Geography- ch 1 The Structure of Solar System (Extra Questions)

The Structure of Solar System (Extra Questions)

1. What is the name of our galaxy?
 Milky Way

2.  Write one interesting fact about the universe .
 Universe is still expanding

3. Name the closest star to our Solar System?
Proxima Centauri

4. Is sun a star or a planet?
 star

5. What Causes moon to go through different phases?
 Its rotation on its axis and revolution around Earth cause phases of moon as different parts are illuminated .

6. Difference between star and planet

Star	Planet
Is huge in size.	Much smaller in size.
Emits its own light.	Planet does not have its own light.
Does not revolve around any other celestial body.	Revolves around a star.
Stars twinkle.	Planets do not twinkle.

7. What is meant by the "solar system"?
The sun and nine planets which revolve around make a family of sun or solar system. There are 44 satellites in solar system.

8.  Name all the planets according to their distance from the sun.
 The planets according to their distance from the sun are : Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto.

9. Why is the Earth called a unique planet?
The earth is a small member of the Solar System. It is the fifth in size of nine major planets and third in distance. But it has unique position in Solar System.

10.  Why do we see only one side of the moon always?
The moon revolves round the earth in about 27 days and 8 hours. It lakes exactly the same time in completing one rotation about its axis. As such we always see only one side oof the moon while the other side always remains away from us.

11. What is the universe?
The Universe is the whole body of stars, planets, satellites and gases. It is endless. Stars are huge bodies of glowing gases e.g. sun. Planets and satellites do not have heat and light of their own. They are lit by the light of the stars.

12. What will be the earth like without solar energy?
 Without solar energy the earth would be cold and lifeless.

13.What are asteroids?
  Between the orbits of Mars and Jupiter, there is a swarm of small bodies which also revolve round the sun.

14.  Differentiate between a planet and a satellite.

A planet	A Satellite
1. Roughly a planet has a spherical body.	1. A satellite lie as a relatively small body.
2. It revolves round the sun in an elliptical path known as its orbit.	2. It revolves round its planet.
3. There are nine major planets.	3. There are in all thirty-two satellites.
4. The word 'planet' means wanderer.	4. The word 'satellite' means 'companion' or 'attendant'.
5. The earth is its good example.	5. The moon is its good example. It is a satellite of the earth.

15.  What is the Universe?
The universe consists of billions of galaxies.

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

The moon revolves around the Earth in about 27 days. It takes exactly the same time to rotate on its axis. To complete both the moments, the Moon takes the same time. This is the reason why we see only one side of the Moon.

 Fill in the blanks.

1. A group of stars forming various pattern is called constellation.
2. A huge system of stars is called galaxy.
3. Moon is the closest celestial body to our earth.
4. Earth is the third nearest planet to the sun.
5. Planets do not have their own heat and light.