eksosferë

The eksosferë is the outermost layer of Earth's atmosphere, gradually merging with outer space. Its altitude is not precisely defined, but it is generally considered to begin around 500 to 1,000 kilometers (310 to 620 miles) above the Earth's surface and extend outwards for thousands of kilometers. The density of particles in the eksosferë is extremely low, so low that atoms and molecules can escape Earth's gravitational pull and drift into space.

The eksosferë is primarily composed of hydrogen and helium, the lightest elements. Due to the very low density, collisions between particles are rare. Individual particles follow ballistic trajectories, often determined by collisions with solar radiation. The temperature in the eksosferë is very high, but because the density is so low, very little heat is actually transferred.

Satellites, including the International Space Station, orbit within the lower regions of the eksosferë. The boundary between the eksosferë and outer space is not a sharp line but a gradual transition. The eksosferë plays a role in phenomena such as auroras, where charged particles from the sun interact with the Earth's magnetic field. Understanding the eksosferë is important for satellite operations and for studying the interaction of Earth's atmosphere with the solar wind.