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Of the nearest celestial objects, there are three that are reachable by modern rocket technology and at the same time potentially interesting for colonization: the Moon, Venus and Mars. Why do most futurists and science fiction writers focus on the red planet and criminally neglect our closest orbiter or planet of the goddess of love? Why is Venus not the hell of the solar system as the fans of Mars (grouping into various societies) want to convince us so vehemently? Can a self-sufficient civilization be established on the moon? This lecture will try to answer these and related questions.