A terrestrial planet, telluric planet or rocky planet is a planet that is composed primarily of silicate rocks or metals. Within the Solar System, the terrestrial planets are the inner planets closest to the Sun. The terms are derived from Latin words for Earth (Terra and Tellus), as these planets are, in terms of composition, "Earth-like".
Terrestrial planets have a solid planetary surface, making them substantially different from the much larger gas giants, which are composed mostly of some combination of hydrogen, helium, and water existing in various physical states.
Read more about Terrestrial Planet: Structure, Solar Terrestrial Planets, Extrasolar Terrestrial Planets, Types
Famous quotes containing the word planet:
“...I, his wife, rested and was warmed in the sunlight of his loyal love, and glorious fame, and now, even though his beautiful life has gone out, it is as when some far off planet disappears from the heavens, the light of his great fame still falls upon and warms me.”
—Julia Dent Grant (1825–1902)