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Sky Above Us Class 1 Notes Science

The sky

We see the sun, moon and stars in the sky. These are together called heavenly bodies. The sun is a star too and our earth is a planet while the moon is a natural satellite. All heavenly bodies in space are called the universe.

Colour the objects that you can see in the sky during the day in yellow. Colour the ones that you can see in the night in blue.

Sky Above Us Class 1 Notes Science

If we stand in an open place and look up, we see the sky. We see many different things in the sky at different times. During the day, we can see the sun. The sky looks bright.
We may also see clouds, birds, aeroplanes and helicopters in the sky.

Sky Above Us Class 1 Notes Science

In the night, the sky looks dark. We can see the moon and the stars.

The Sun

The sun is a big ball of fire. It is a star. It gives us light and warmth.
Every morning, the sun rises in the East. The rising of the sun is called sunrise. As the sun rises, it spreads light and the day begins.
Every evening, the sun sets in the West. The setting of the sun is called sunset.
As the sun sets, it becomes dark and night falls.
The sun is very big but as it is very far away from the earth, it looks small.

Sky Above Us Class 1 Notes Science

Do you know?
We see that the position of the sun changes in the sky with time. But this is because the earth is moving around the sun and not the other way around.

The Moon

After sunset, we see the moon in the sky.

Sky Above Us Class 1 Notes Science

The moon gives us light at night. But this light is not of its own. It is the light of the sun which falls on the moon.
In size, the moon is much smaller than the sun. Yet, it appears big because it is much closer to the earth. In fact, it is smaller than the earth also.
The shape of the moon changes every night.

Sky Above Us Class 1 Notes Science

The Stars

We also see many stars twinkling in the night sky. Like the sun, they are also very hot. But, as they are far away from the earth, their warmth does not reach us. And due to their being far away, they also appear like tiny spots in the sky.

Sky Above Us Class 1 Notes Science

Do you know?
The first man to step on the moon was Neil Alden Armstrong.
Sky Above Us Class 1 Notes ScienceSky Above Us Class 1 Notes Science

Do you know?
In earlier times, sailors used to find their direction in the sea with the help of the stars. When the sailors saw the North Star in front of them in the sky, they knew they were moving in the North direction.

Try it out

Which of the following is not seen in the sky at night?

  1. Sky Above Us Class 1 Notes Science
  2. Sky Above Us Class 1 Notes Science
  3. Sky Above Us Class 1 Notes Science

Let Us Revise

  1. The sky looks bright during the day and dark in the night.
  2. The sun is a big ball of fire
  3. The sun gives us light and warmth
  4. The sun rises in the East and sets in the West
  5. It becomes day with sunrise and dark with sunset. 
  6. The moon gives us light at night
  7. The tiny, twinkling stars in the night sky are actually very hot, just like the sun.
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FAQs on Sky Above Us Class 1 Notes Science

1. What is the significance of the sky?
Ans. The sky is significant as it is the expanse above the Earth where we can see the atmosphere and celestial objects such as the Sun, Moon, and stars. It provides us with weather patterns, daylight, and a sense of depth and vastness.
2. How does the Sun affect the Earth's atmosphere?
Ans. The Sun plays a crucial role in heating the Earth's atmosphere through the process of radiation. The Sun's rays warm the Earth's surface, causing the air to heat up, rise, and create weather patterns. It also provides light and energy for photosynthesis, maintaining the balance of life on Earth.
3. Why does the Moon appear to change its shape?
Ans. The Moon appears to change its shape due to its position relative to the Earth and the Sun. As the Moon orbits the Earth, different amounts of sunlight illuminate its surface, creating different phases. When the Moon is between the Earth and the Sun, we see the New Moon, and as it moves to the opposite side, we see the Full Moon.
4. How are stars formed?
Ans. Stars are formed through a process called stellar nucleosynthesis. It begins with the gravitational collapse of a cloud of gas and dust, known as a nebula. As the cloud contracts, it heats up, and fusion reactions occur, converting hydrogen into helium. This fusion releases energy, causing the newly formed star to shine and continue its life cycle.
5. Can we see all the stars in the sky?
Ans. No, we cannot see all the stars in the sky. The number of stars visible to the naked eye is limited due to factors such as light pollution, atmospheric conditions, and the sensitivity of our eyes. However, there are billions of stars in the universe, and with the help of telescopes, we can observe a larger portion of them.
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