Astronomy

The Terrestrial planets are defined as rocky planets or telluric planets, and they are Mercury, Venus, Earth and Mars. These planets have a lot of similarities that allow them to be grouped together, especially in contrast to the Jovian or gas planets. The telluric planet is one given type of planet, defined as one that is primarily composed of rocks and heavy metals. Thus, the composition of these planets is similar to each other, which makes for a proper comparison between them (Cessna, 2010).

With respect to composition, telluric planets contain a core, which is made up of molten iron. The core traps energy from the formation of the planet, and this molten core is then surrounded by silicate rock, a layer known as the mantle. There are surface layers of rock as well, and then usually a telluric planet will have an atmosphere. However, the atmosphere of some,...
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