How big is the exosphere?

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How big is the exosphere?​

The exosphere is the very edge of our atmosphere. This layer separates the rest of the atmosphere from outer space. It’s about 6,200 miles (10,000 kilometers) thick. That’s almost as wide as Earth itself. The exosphere is really, really big.

How long does it take for the exosphere to dissipate?​

In contrast to the denser atmospheres of Earth, Venus, and Mars, the contents of Mercury’s exosphere are transient and must be continually replenished. If the source processes for Mercury’s exosphere suddenly stopped, the exosphere would dissipate in just 2–3 days.
What can escape from the exosphere?
In the exosphere the probability of collisions is so small that particles execute ballistic trajectories, some of which carry them away from the planet. The most important gases that can escape from Mars are hydrogen, oxygen, carbon, and nitrogen. Molecular hydrogen (H 2) is a product of series of reactions in the lower atmosphere.
Why is the exosphere so cold?
The exosphere is really, really big. That means that to get to outer space, you have to be really far from Earth. The exosphere has gases like hydrogen and helium, but they are very spread out. There is a lot of empty space in between. There is no air to breathe, and it’s very cold.

Is the International Space Station in the exosphere?​

For example, GPS, telecommunications, and weather satellites all circle the Earth in the exosphere. But the International Space Station (ISS) is directly below the exosphere in the thermosphere. In the exosphere, it’s where hydrogen atoms escape to space in the exosphere.

How far into the atmosphere does the exobase extend?​

The exobase can range anywhere from about 500 to 1000 km into the atmosphere, depending on the intensity of solar and geomagnetic activity. There is no defined upper boundary because how it gradually fades into the vacuum of outer space.
Is hydrogen present in the exosphere?
Hydrogen is present throughout the exosphere, with some helium, carbon dioxide, and atomic oxygen near its base. Because it can be hard to define the boundary between the exosphere and outer space (see “Upper boundary” at the end of this section), the exosphere may be considered a part of the interplanetary medium or outer space .