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- 30 What could restrain post-singularity societies from spreading across the Galaxy?
- 29 How would winds behave on a tidally locked planet?
- 26 What is the minimum size of a self-sufficient industrial country?
- 26 Is there a scientifically sound faster-than-light travel system for a spaceship?
- 25 What minimal radius is needed for rotation to simulate gravitation without adverse effects on humans?
- 23 Why did Venus not lose its atmosphere without magnetic field?
- 21 Is metal-based, or other non-carbon-based, life realistic?
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