This is where the earth ends

Yes, Earth ends at a certain point and space begins. But where is the point? Believe it or not, this may seem like a simple question but it doesn’t have an easy answer. we will! The further away from the planet, the thinner the atmosphere and the less oxygen. This is why airplanes that fly at high altitudes have pressure and contain a lot of oxygen in them. As you reach more than 500 miles (about 800 kilometers) above Earth’s surface, the atmosphere begins to gradually merge with charged particles from the Sun that remain trapped in Earth’s magnetic field.

Katrina Bossert, an astrophysicist at Arizona State University, quoted by life science “The composition also changed, and the lighter atoms and molecules began to dominate, while the heavier molecules remained closer to the Earth’s surface,” he said. The boundary between Earth and space was defined by the Hungarian-American physicist Theodore von Karmann in 1957, and as such, this line is known as the Karman Line. This is an approximate area indicating the altitude at which a satellite can orbit Earth without burning up or falling out of orbit before orbiting Earth at least once. Usually defined as 100 km [62 miles] above ground. However, orbiting the Earth at an altitude lower than the Kerman Line would require very high orbital velocities, which would be difficult to maintain due to friction.

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According to the Live Science post, satellites in low-Earth orbit, for example, less than 621 miles (1,000 km) but sometimes 99 miles (160 km) above Earth tend to fall out of orbit after a few years. from Earth’s upper atmosphere gradually slows the orbital velocity.” However, this does not mean that Earth’s atmosphere ends there and cannot be detected after 621 miles. Still thousands of kilometers from the edge of the Earth’s atmosphere.

But note that the Kerman Line is an imaginary but practical threshold between air travel and space travel, and as such, people won’t even notice the intersection.

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