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Where does the Earth's atmosphere end and space begin?

Where does the Earth’s atmosphere end and space begin?

Where does the Earth’s atmosphere end and space begin?

Monday – Shawwal 1 1443 AH – May 02, 2022 AD

London: «Middle East Online»

Scientists determine where each layer of the atmosphere begins and ends with four main features; It changes the temperature, chemical composition, density, and movement of gases within it.
With these features in mind, scientists ask the following question: Where does the Earth’s atmosphere actually end up? Where does space begin?
According to NASA, each layer of the atmosphere plays a role in ensuring the ability of the planet to host all types of life, by providing the necessary conditions for this, starting from blocking cosmic radiation that causes cancer to creating the pressure required to produce water.
In that, Arizona State University astrophysicist Katrina Bossert told Live Science, “The further you move away from the Earth’s surface, the atmosphere becomes less dense, the composition also changes, and lighter atoms and molecules begin to dominate, while heavier molecules remain closer to the surface. ground”.
In this context, scientists have identified the area where the air becomes so thin that conventional aircraft cannot fly at all, with this vehicle not being able to generate sufficient lift force, the end of our atmosphere and the beginning of space, and is known as the “Karman Line”, which is named after the name Theodor von Karmann; The Hungarian-American physicist who in 1957 became the first person to attempt to delineate the boundary between Earth and outer space.
“The Karmann line is an approximate area that indicates the height above which satellites will be able to orbit the Earth without burning up or falling out of orbit before orbiting the Earth at least once,” Bossert explains.
“A region is usually defined as 100 kilometers (62 miles) above the Earth,” Eagle says. It is possible for something to orbit the Earth at altitudes lower than the Karmann line, but that would require a very high orbital velocity, which would be difficult to maintain due to friction, but nothing prevents that… Herein lies the meaning one should have for a line Karman: It’s an imaginary but practical threshold between air travel and space travel.
And Bossert explains that “the atmosphere does not disappear as soon as you enter the area in which the satellites orbit, it is thousands and thousands of kilometers away before the evidence of the Earth’s atmosphere disappears, and the very outer atoms can extend from the Earth’s atmosphere, and the hydrogen atoms that make up the Earth’s crown (the area outer space) to beyond the moon.
According to scholars, the Karman line is not material in itself and therefore one will not notice its crossing and it has no thickness.
“In principle, it is still possible to fly up to the Karmann Line, but in practice, animals cannot survive at altitudes higher than (the Armstrong limit), which is about 20 kilometers (12 miles) above the surface, where the pressures are higher,” Eagle says. So low that the fluid in the lungs boils.

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