Essay about atmosphere evolution of rocky planets

2540 Words Oct 19th, 2013 11 Pages
Atmosphere Evolution on Rocky Planets

Atmosphere can be defined as a gaseous compound layer surrounding a large body mass suspended by means of gravity and centrifugal force caused by rotation [1]. Atmospheres of planets have not always been the same, its evolution comprised of complex development across million years of geologic time affected by various changes of variables inside and outside its planet [2]. Of the interest of this essay is the atmospheric evolution of a rocky planet. Rocky planet is a terrestrial body consists mainly of silicate or metal [3]. Some known rocky planets with substantial atmosphere such as Venus, Mars and Earth has a very different composition of atmospheric gas [4]. These planets experienced very
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The closer the planets to the Sun, the higher heat radiation it receives from the Sun [15]. This will affect the initial possible temperature on the planet surface. On the other hand, atmospheric pressure and composition affect the greenhouse gas effect as well as deflection of ultraviolet and heat from the Sun [15]. Combination of these effects results in different surface temperature as shown on the table above.
The atmospheric conditions of planets are related to gravity strength and temperature of the atmosphere. Atmosphere can be retained for a longer duration when the gravity is high and the temperature of atmosphere is low. [1] Table shows that the gravity of Earth is the highest, followed by Venus, and Mars. The gravity of Earth and Venus are similar. Therefore, the atmosphere of both Earth and Venus can be retained for a longer period of time, while Mars’ atmosphere can only be retained in a shorter

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