Sky is a term we use to explain a recipe of gases present above us. However, sky is not a scientific term to explain the phenomenon. Scientists like using the word atmosphere to explain the blue roof above our heads.

You must have also wondered that the sky does not seem to end anywhere and extends as far as the human eye can see. It also makes us curious as to where does the sky actually start and where does it end. Here is everything you need to know about it;

What is a sky?

The sky is actually the expansion of space which surrounds the earth. It appears blue in the day and dark in the night.

If the sky is to be explained according to science, then it would be the atmosphere i.e. the layer of gases which surround the earth and everything in the space that lies beyond.


Where does the sky actually start?

The sky is nothing like a tent above our heads whose starting and ending points could be measured. If we see a bird flying 50 meters above our heads, it looks like it is flying in the sky.

However, the airplanes do the same even though they fly more than a count of 10,000 meters above our head. Mostly the atmosphere above our heads starts at 16km upwards from the surface of the earth. It goes beyond what we can measure.

The composition of gases

The atmosphere is a composition of gases. It is 78% nitrogen, 21% oxygen and 1% argon. The final fragment of this atmosphere is made of a number of trace gases such as water vapors, ozone and fine dust particles.

Layers of atmosphere

The science says that there are 5 main layers of our atmosphere.

  1. Troposphere
  2. Stratosphere
  3. Mesosphere
  4. Thermosphere
  5. Exosphere

Troposphere starts from the ground level and goes up to 9 miles. This atmospheric layer is the one responsible for the weather changes.

night sky

The Big Bang Theory

The Big Bang Theory is the prevailing cosmological model which explains the existence of the space and everything present in it, from the beginning of the times till now. It explains the observable universe from the earliest known periods and the subsequent and large-scale evolution it went through.

This theory explains how the whole space including moons, their stars, the planets, the sun and the entire atmosphere came into being. It says that after the huge explosion the earth cooled down and it developed a cloud of atmosphere around it. This atmosphere is actually the sky which has a recipe of gases suitable for us to live in.

As a summary we can say that there is no sky and it is all an optical illusion which is created by the sunlight’s refraction into the atmosphere. If we look closely at the sky in the night, that is what’s always there, space!

Posted by:Aqeela Nawaz Malik

A free soul.

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