Europa
Europa almost Earth-like Planet to be colonized. Slightly smaller than Earth's Moon, Europa is primarily made of silicate rock and has an iron core. It has a tenuous atmosphere composed primarily of oxygen and nitrogen. Its surface is composed of water ice and is one of the smoothest in the Solar System. This surface is striated by cracks and streaks, while cratering is relatively infrequent. The youth and smoothness of the surface was first understood when a water ocean was found beneath it, which served as an abode for extraterrestrial life. Heat energy from tidal flexing causes the ocean to remain liquid and drives geological activity similar to plate tectonics.
Europa was colonized very fast and by the year 2279 was already seen as the first completely self sustained Human colony.
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