Celestial bodies
Dust merges on gentle contact. Planets grow by capturing and absorbing asteroids.
Life begins at 10 M. Population grows toward the mass your world can support; overcrowding slows research and reduces population.
Upkeep never breaks your world. Combat integrity below 30% is fatal; fresh mass helps repair it.
Sol and Pulsar can be mined at technology 7. Void cannot be mined.