Marvels of sky. || Unit 6 || EVS || Class 4

 

 

 

 

 

 

Q1. What are the things we see in the sky?

A. We see the Sun, Moon, stars, and planets in the sky.

Q2. What is the solar system?

A. The solar system is the system which consists of the Sun , eight planets and their satellites, and many other celestial bodies .

 

 

Q3. Name the eight planets of the solar system.

A. The eight planets are

 Mercury,

 Venus,

 Earth,

 Mars,

 Jupiter, 

Saturn, 

Uranus, 

Neptune.

Q4. Which planet do we live on?

A. We live on the planet Earth.

Q5. What is revolution?

A. The movement of the Earth around the Sun in a fixed path is called revolution.

Q6. How long does the Earth take to complete one revolution around the Sun?

A. The Earth takes one year (3651/4 days) to complete one revolution.

Q7. What is rotation?

A. The movement  of the Earth on its own axis is called rotation.

Q8. How does day and night happen?

A. Day and night happen because the Earth rotates. When our side of the Earth faces the Sun, it is day; when it turns away, it is night.

Q9. What is a satellite?

The celestial bodies that revolve around the planets are known as satellites.

Moon is the satellite of the earth

 

Q10. Which is the natural satellite of the Earth?

A. The Moon is the natural satellite of the Earth.

Q11. Why does the Moon shine?

A. The Moon shines because it reflects the light of the Sun.

Q12. What does the Sun give us?

A. The Sun gives us light and heat.

Q13. What are planets?

A. The celestial bodies that revolve around the sun in definite path are known as planets. 

 

 

What is New Moon Day and Full Moon Day?

(Answer TB.Page 111) 

 

Neil Armstrong

* Neil Armstrong was an American astronaut.

*. He was the first person to walk on the Moon.

* He landed on the Moon on July 21, 1969.

(Moon day)

 

 

* His spacecraft was called Apollo 11.

* Neil Armstrong said the famous words, “That’s one small step for man, one giant leap for mankind.”

Moon Expedition of India

India’s Moon expedition is called Chandrayaan, 

*The first mission, Chandrayaan-1, was launched in 2008. It helped scientists find water on the Moon for the first time.

 

*The second mission, Chandrayaan-2, was launched in 2019 to study the Moon’s south pole.

*The third mission, Chandrayaan-3, was launched in 2023, and it made India the first country to land near the Moon’s south pole.

 

How Does the Surface of the Moon Look Like?

The surface of the Moon looks rough .It has many hills, deep holes called craters, and rocks all around.

There is no air or water on the Moon, so everything looks dry and dusty.

When we see the Moon from Earth, the bright parts are its high lands, and the dark spots are flat plains.

 

 The scientific study of moon is known as ____

selenology.

 

The study of the surface and physical features of moon is called _____

selenography.