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Atmospheres : layer of gaseous molecules held by gravity

Atmospheres of Terrestrial Planets

- Gravity can hold the vapors released from within the planet

(Volcanoes can supply water vapor, CO2, N2 and sulhur gases)

- - Volatiles can be captured b impacting asteroids/comets ( Comets and asteroids contain water CO2, ice and or other volatiles)

Early atmospheres of terrestrial planets were initially dminated by CO2 and water vapor

Atmospheres of the jovian planets retained their primeval atmospheres. They were massive enough to capture significant amount of H and He

Jovian planets are far away from the Sun to be unaffected by its heat and inds

Loss of Atmosphere

- Atmospheric gases may be lost through varous processes.

* Thermal escape - the gas gets too ht t held hold on by the gravitational force.