Mars is the fourth planet in the Earth's solar system.  With an atomsphere far thinner than our own, it be only barren  red rock devoid of life. But it had not always been this way. Four billion years ago the earth held nothing but rocks, waves and air. It was not ready for life. However that was not the case with mars. For at that time it had known intelligent life, a race of beings known as the Prothado. 

It is inhabited by the Aihai, a race of intelligent beings.