Mars

Mars (火星, Kasei) is a planet located in the same solar system as the Earth. It is the native homeworld to the humanoid species known as the Martians; they refer to the planet as M'arzz. It is the home of Martian Manhunter, Miss Martian, Ma'alefa'ak J'onzz, and B'arzz O'oomm.

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 * —About Planet Mars.

History
Martians live in caves under the surface, because the surface of the planet is inhospitable. The planet has an active society, where communication is almost entirely telepathic. The green and red Martians look down on the white Martian minority. The planet is ruled by a royal family.