The telluric planets (of the Latin tellus , ground, ground), in opposition to the gas planets, are Planet S of structure zonée in the shape of encased spheres similar to that of the Ground; i.e. they have three concentric envelopes in general (core, coat and crust). Their surface is solid and they are made up mainly of elements not-birds; generally silicated rocks and possibly a metal core. Their Densité thus relatively important and lies between 4 and 5,5.
Dans the Solar system, the telluric planets are the four internal Planets, located between the Sun and the Ceinture of asteroids: Mercury, Venus, Earth and Mars. The the Moon as well as the largest natural satellites of another planets have a similar structure and could thus also be described as telluric .

One actively seeks planets of this kind among the planetary systems others that ours, but their detection is made difficult by their low mass (and their proximity with star) compared with that of the gas giant and of the star S. a telluric exoplanète was discovered and this discovery was returned public in April 2007: Gliese 581 C (another seemed to be discovered, OGLE-2005-BLG-390Lb, on January 26th, 2006).

Formation process

The heaviest materials (Nickel, Iron) converge towards the center of planet to form its core. Under the pressure, the center of the core can become solid, but accumulated heat can leave part of this one fluid. Other materials, of Density slightly lower, are taken between the core and surface, constituting a coat whose fluidity is function of the residual temperature of planet. Surface constitutes a crust materials of less density. The least dense materials (Eau, Gaz) are expelled towards surface and can constitute a atmosphere if the Gravité of planet makes it possible to retain them in spite of their lightness and the tendency which has the Solar wind to carry them.

See too

Internal bonds

• Giant gas

• Planet chtonienne
• Exoplanète

Zh-min-nan: Tē-kiû-hêng he̍k-chheⁿ