The First Colonies were the first wave of human colonization after the discovery of the Hyperdrive. With Terraforming technology not yet perfected, these worlds were limited to those that already possessed a sufficient climate and atmosphere to support human life. Only about a dozen such worlds were discovered in the first 200 years of hyperspace exploration. With compatible (or nearly so) environments these worlds could be settled with minimal effort. This led to large populations emigrating to these worlds and the first colonies became prosperous population centers with millions of citizens.