Terrestrial planet Terrestrial planet 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, i.e. Mercury, Venus, Earth, and Mars. The terms "terrestrial planet" and "telluric planet" are derived from Latin words for Earth ("Terra" and "Tellus"), as these planets are, in terms of structure, "Earth-like". Terrestrial planets have a solid planetary surface, making them substantially different from the larger giant planets, which are composed mostly of some combination of hydrogen, helium, and water existing in various
Ego the Living Planet the company-wide crossover storyline "Maximum Security", appearing in "Avengers" #35 (Dec. 2000); "Maximum Security: Dangerous Planet" (Oct. 2000); "Iron Man" #34–35 (Nov.–Dec. 2000); "X-Men Unlimited" #29 (Dec. 2000); "Gambit" #23 (Dec. 2000) and "Maximum Security" #1–3 (Dec. 2000Jan. 2001). The character returned in "Nova" vol 4 #20–30 and "Astonishing Thor" #1–5 (Nov 2010July 2011). Ego the Living Planet also appeared in the "Oni Press Color Special." Ego once told Thor that his existence was the result of a scientist merging with a planet when that planet's sun went nova. Ego began absorbing space vessels and even other worlds to survive