A leader by its meaning is one who goes first and leads by example, so that others are motivated to follow him. This is a basic requirement. To be a leader, a person must have a deep-rooted commitment to the goal that he will strive to achieve it even if nobody follows him! Joshua was such a man.
An artist's conception shows a terraformed Mars in four stages of development. Terraforming (literally, Earth-shaping) of a planet, moon, or other body is the hypothetical process of deliberately modifying its atmosphere, temperature, surface topography or ecology to be similar to the environment of Earth to make it habitable by Earth-like life.
Terraria (pronounced similar to Terrarium) is a very detailed 2D Wide Open Sandbox indie game, created by Andrew Redigit Spinks and Jeremy Blue Guerrette. It was made available on Steam on May 16, 2011 and has received a ton of massive updates ever since.