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  1. Building Planets in Cyberspace

    Recipe: Take a rocky mass [about 12.8 thousand kilometers (nearly 8 thousand miles) wide], add carbon dioxide, water vapor and methane. Place in stable, circular orbit, the same distance from a sunlike star as the distance between Earth and the Sun. Heat to an average of 10 degree Celsius (50 degrees Fahrenheit) for 1 billion years.