Let's look at the next picture. The bottom circle is the surface of the Earth.
The upper circle is the upper limit of the atmosphere. The red dot is an observer on the surface of the Earth. And the green lines are the paths that light takes through the atmosphere to the observer.
As you can see, the length of the light path in the atmosphere depends on the direction of arrival of the light. If the observer looks up, then the light passes through the entire thickness of the atmosphere, and if the observer looks along the horizon, then the light passes through a much greater thickness of the same atmosphere. Namely, the horizontal path of light to the observer should be about 8 times greater than the vertical one.
What does this mean? This means that the light must undergo 8 times more scattering than if the light were traveling vertically.
Now let's imagine that we are an observer, and that we have cloudy weather in our yard - such that the stars above our heads are barely visible.
Would it be reasonable to assume that under such a condition, the stars located above the horizon should not be visible at all? However, practical observations of the sky do not confirm anything of the kind! In cloudy weather, the stars above your head are visible as much as the stars that are located above the horizon.
From this fact, only one single conclusion is possible: the vertical thickness of the atmosphere should be Roughly equal to the horizontal thickness of the atmosphere. And this
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is possible only if the vertical thickness of the atmosphere is NOT LESS than the radius of the Earth itself.
It follows from this that the dense layers of the atmosphere in their thickness should be at least 6000 km. And not at all 100 kilometers, as semi-official science claims.