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	{{Atmosphere-stub}}		{{Atmosphere-stub}}
			==Exosphere==
			<gallery>
			File:EarthAtmosphereBig.jpg\|Earth's atmosphere layers
			File:Earth’s_geocorona_from_the_Moon.jpg\|Earth's geocorona as seen from the Moon
			File:IBEX_ENA_Feature_FInal_Fig3.jpg\|IBEX ENA feature
			</gallery>

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'''Exosphere''' is the outermost layer of a planet's [[atmosphere]], lying above the [[thermosphere]]. It is the boundary where the atmosphere thins out and merges with [[outer space]]. The exosphere is characterized by extremely low densities of particles, which means that the individual atoms and molecules are so far apart that they can travel hundreds of kilometers without colliding with one another. This layer is significant for several reasons, including its role in the escape of atmospheric gases into space and its interaction with solar and cosmic radiation.

==Characteristics==
The exosphere is composed primarily of [[hydrogen]] and [[helium]], with trace amounts of heavier elements and compounds. The temperature in this layer can vary widely, depending on solar activity. During periods of high solar activity, temperatures can rise significantly as the solar ultraviolet (UV) and X-ray radiation is absorbed by the particles in the exosphere.

One of the defining features of the exosphere is the concept of the [[exobase]], the lower boundary of the exosphere, which is the altitude where the atmosphere's mean free path of the particles becomes comparable to the scale height. This is typically around 500 to 1,000 kilometers above the Earth's surface but can vary depending on solar activity and the atmospheric composition of the planet in question.

==Importance==
The exosphere plays a crucial role in the dynamics of a planet's atmosphere. It is in this layer that atoms and molecules can escape into space, a process known as [[atmospheric escape]]. This escape occurs because, at such high altitudes, particles can achieve escape velocity due to thermal energy or through interactions with electromagnetic fields.

Furthermore, the exosphere is important for its interactions with the [[magnetosphere]] and [[solar wind]], which can have significant implications for space weather and the protection of a planet's atmosphere from solar radiation. The exosphere's composition and behavior also provide valuable insights into the processes of planetary formation and evolution.

==Study and Exploration==
The study of the exosphere is challenging due to its low particle density and the difficulty of sending spacecraft to such high altitudes. However, observations can be made using ground-based telescopes, satellites, and space probes equipped with instruments capable of detecting the sparse particles and measuring their properties. These studies are crucial for understanding the composition, dynamics, and variability of the exosphere and its interactions with the rest of the atmosphere and outer space.

==See Also==
* [[Atmosphere of Earth]]
* [[Space weather]]
* [[Magnetosphere]]
* [[Atmospheric escape]]

==References==
<references/>

[[Category:Atmosphere]]
[[Category:Planetary science]]

{{Atmosphere-stub}}

Exosphere - Revision history

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