The Solar System - Class 4 Science - New St. Mery English School

The Solar System is a fascinating family of the Sun and the objects that move around it. At the center of the Solar System is the Sun, which gives us heat and light. Around the Sun, there are eight planets that travel in fixed paths called orbits. These planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.

Our planet Earth is the only planet known to support life. Besides planets, the Solar System also includes moons, asteroids, and comets. All these heavenly bodies are held together by the Sun’s strong gravitational force.

In this chapter, we will learn about the Sun, the planets, and other interesting objects in space. Let us explore the amazing world of the Solar System and discover how our planet fits into this big universe! 

The Solar System - Class 4 Science - New St. Mery English School

What is Solar System?

Ans:- The Sun is a huge, hot ball of gases at the center. It gives us light and heat, which makes life on Earth possible.

What is sun?

Ans:- The Sun is a huge, hot ball of gases that is present at the center of solar system. It gives us light and heat, which makes life on Earth possible.

What are planets?

Ans:- The large celestial bodies that revolve around the sun on a fixed path and do not have their own light are called planets.

How many planets in solar system?

Ans:- There are eight planets in solar system. 

1- Mercury 

2- Venus

3- Earth 

4- Mars

5- Jupiter

6- Saturn

7- Uranus

8- Neptune 

Mercury - It is nearest planet to the sun. It is smallest and very hot during the day and very cold at night. 

Venus- It is second planet from the sun. It is the hottest and the brightest planet ,also called 'the morning and the evening star'. It also does not have any moon.

Earth:- It is the third planet from the sun. It is the only planet where life exists. It has all the suitable conditions to support life about seventy percent of Earth's surface is covered with water,so it is also called blue planet . The earth has one moon.

Mars:- It is fourth planet from the sun , also known as 'red planet's. It look red in colour. It has two moon.

Jupiter:- It is the fifth planet from the sun. It is the largest planet of the solar system. It has about 79 moons.

Saturn:- It is the second largest planet, sixth from the sun. It has seven wide rings around it which are made up of ice and dust . It has 62 know moons.

Uranus:- It is the third largest planet ,seventh from the sun.it has 27 known moons.

Neptune:- It is the eighth planet from the sun. It is the coldest planet in the solar system. Neptune has around 14 moons.

What are satellites?

Ans:- The object that revolve around a planet in an orbit is called satellite.

What is moon? 

Ans:- Moon is the natural satellite of the earth. It completes one revolution around the earth in 27 day. The moon does not have its own light but it reflects the light of the sun. It shines at night because of sun's light.

Write three feature of moon?

Ans:- three feature of moon.

1- It does not have the atmosphere as the earth has.

2- there is no water on the moon.

3- The surface of the moon is made up of rock and many mountains and crater.

What are artificial satellites? 

Ans:- The man - made object which move around a planet in an orbit are known as artificial satellites.

Which is the first artificial satellites of world?

Ans:- first artificial satellites was the sputnik-1 , launched by USSR on October 4,1957.

Which is the first artificial satellites of India?

Ans:- first artificial satellites Indian satellite was aryabhata. The launched on April 19,1975.

Write three uses of artificial satellites?

Ans:- three uses of artificial satellites are:

1- they are used to study weather conditions planets and stars.

2- they help in communication through telephone, radio and TV.

3- they are used in GPS ( global positioning system). 

What are stars?

Ans:- the number of twinkling objects that are appear in night sky are called stars.

Why does stars seer to be very small?

Ans:- stars are many times larger than the planets but they seems to very small because they are very far away from us.

Who is the nearest star to the earth?

Ans:- the sun is the nearest star to the earth .

What are constellation?

Ans:- the group of stars that from patterns in the sky are called constellation.

Ex:- ursa, major, ursa minor, Orion etc.

How many types of movement of earth? 

Ans:- there are two types of movement of earth.

1- revolution 

2- rotation 

What is orbit?

Ans:- the earth moves on a fixed path around the sun. This fixed path is called an orbit.

What is revolution?

Ans:- the movement of the earth around the sun in an orbit is called revolution. It takes 365 days to complete one revolution.

What is rotation?

Ans:- the earth spins on its own axis just like a top rotation on its pin. This is called rotation of the earth. It takes 24 days for the earth to complete one rotation.

Write two effects that eauses due to earth's movement ?

Ans:- the two effects that eauses due to earth's movement are.

1- the rotation of the earth causes day and night.

2- season are caused due to revolution of the earth around the sun.

Who divided the earth into two parts?

Ans:- the epuator divided the earth into two halves, called the northern hemisphere and the southern hemisphere.