The Dortheans were the first civilisation in The Solar System, nearly 4 billion years ago. Their technology was primitive. It is unknown where they come from; some argue they are related to Martians, others say they are from another system. They named the planets in the solar system: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 and 11. (1 was Mercury, 2 was Venus, 4 was Earth, 5 was Mars, 6 and 7 are now merged and called Jupiter, 8 was Saturn, 9 was Uranus, 10 was Neptune, and 11 Pluto. They did not know of any of the further out planets).