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What is the sky?


 

What is the sky

What is the sky

The sky is defined as that which corresponds to the surface of the earth to the top and thus has included many parts of the universe,but it can be defined more clearly as the area that corresponds to the surface of the earth, from sea level to a height of 100 km, which is an area called the Carmen Line, which is the boundary between The sky and space, so that this is the boundary in one of the layers of the atmosphere.

Why is the sky blue?

Gases and particles surround the globe with the problem of the atmosphere or what is known as the sky, especially the gases of nitrogen and oxygen, and these gases are known to be invisible, but when the sun's rays penetrate the atmosphere, they are exposed to the gas molecules that make up it, and thus those particles analyze the white light that contains what It is called the colors of the spectrum of different wavelengths, then these gases absorb the wavelengths of colors such as red and green except for those related to the blue color, which only reflects them, which gives that blue color to the sky.

Layers of the atmosphere

The atmosphere extends from the surface of the earth up to the space in the form of layers, each of which has certain characteristics, and therefore the sky joins the atmosphere but only certain layers, and among the most important layers of the atmosphere that represents the sky are the following

The troposphere

It is considered the first layer of the atmosphere, which extends from the surface of the land to a height of 10 km, and it is the layer in which climate changes occur and directly touch the surface of the earth, and thus living organisms live in this layer.

Stratosphere

It is considered the second layer of the atmosphere and extends up to 50 km above the surface of the earth, and this layer contains the so-called ozone layer that absorbs ultraviolet light from the sun's rays, and it is characterized by high temperatures with increasing altitude.

The mesosphere

The mesosphere is located directly above the stratosphere, so that its distance from the earth reaches 85 km, and it has approximately 1% of the atmospheric pressure present at the surface of the sea, and this layer is also characterized by the burning of most of the meteors in it, and unlike the stratosphere, its temperatures decrease with the increase in height in it . After that, the layers of the atmosphere are considered from within outer space, so that there are three other layers which are the thermosphere, the exosphere, and the inosphere, which reach a height of 190 km above the surface of the earth, and these layers have characteristics that differ from the properties of the layers of the atmosphere known as the Earth's sky, so that they have radioactive and ionic properties. And the lack of gravity.

Written by Suhaib Khaza'leh

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